As others have said, I use declarations for this.  Our group limits declarations to once an action, so this really isn't a big deal (they could easily have used another declaration there).  The only difference is that for really obvious things, I don't make them roll anything, though they still name the relevant skill that allows them to take advantage of it.  And of course it has to make sense for what they are trying to do.

Example: someone turns the lights off.  Mechanically, this is one of three things: a free action (that we'll call the player's declaration) to flip the switch, which is something really easy to do, or a supplemental action (so the lights were on a big lever, and I rule it as equal to trying to cross a zone, and we'll still call that a declaration, or a full action (the lever was REALLY big and hard to move, requiring a might roll) that we'll call a maneuver (because it's going to take someone else doing a maneuver to get the lights back on).

In the first instance, the player goes ahead and also ducks down to hide behind some machinery, with a stealth roll assisted by her declaration for the +2.  In this last instance, the player also makes a declaration of "Hey this light switch is really hard to get to, behind some machinery, so as soon as I flip the switch I'm going to duck down for cover as well, okay?" Now she's got a +2 ready from the maneuver, and another +2 for hiding from her declaration, but she's going to wait until the next round to roll stealth.

The baddie decides to go silent as well, makes a declaration of "the lights just went out", and makes a maneuver (alertness roll opposed by player's stealth roll) of "I draw my gun and cock my ear to listen carefully"... netting him a +2 to whatever darkness can bring, as well as a +2 on a future alertness roll.

Player 2 tries to make for the door, with the intention of declaring the darkness towards his stealth roll as well. Instead I offer a fate point as I tag the darkness against him, and he accepts, tripping over some old machinery.  The baddie uses his +2 on his alertness roll to hear this and target the player.

Player 2 goes ahead and hides, but we call it a her action, and she does so well (with her +4 from last time). despite the -1 for the supplemental action to go ahead and get her gun out. However, she goes ahead and declares (with her guns skill) that she's loaded with hollow-points, since she saw (before the lights went out) that the dude had no armor on. She'll tag it in a minute.

The baddie uses his darkness declaration from earlier, as well as his new declaration (Guns vs athletics: hey, i heard that guy go down, right? So he's off-balance for my attack)  Which - while I simply said the player tripped, makes total sense, so the player is -if not on his butt - at least still stumbling or staggering.  The baddie tags both of these for a +4 to his attack. Player 1 defends (taking some stress), and then tries to get away.. he'll once again use a declaration of darkness to aid in his stealth roll.

Player 2 now uses her guns skill (vs the baddies gun skill) to declare that she saw the guy's position in the muzzle flash from his round. She wins, taps both of her declarations to create a +4 bonus to her guns skill, tags one of her own aspects for a fate point, and is suddenly up +6 to hit the dude. She kindly reminds me that she's stealthed, so I roll an alertness roll for the baddie (who has already used his manuever's free tag, so he's SOL) and he gets caught unaware of the attack, with a defense at zero.  If player 1 has even a +3 gun skill, she's now at +9 to his +0, and assuming they both roll flat, he's looking at 11 stress.  That's enough to hit hard into his consequences, and he concedes (declaring with alertness that a window is nearby, and then fleeing out of it).  Now player 2 turns the lights back on.


So. Basically, the scene condition was usable by everyone. But, it really gave them no more than they could have gotten by declaring other stuff.  The benefit to them was that it required no roll. (Alternatively, you could have them roll with anything over a total of zero being successful, but I try to limit rolls.)

This can work even if the aspect isn't obvious. If the scene aspect is "scentless gas is filling the room", someone would have to discover that (scholarship once they start feeling woozy?)  But that discovery, while it is an assessment that happens as a free action, works pretty much exactly like the declaration above.  Once that person notifies everyone else, they can use it for their declarations, as well.


The reason I do this is that a smart player will quickly realize that there's no downside to trying declarations often... as often as they can think of them.   So tagging the scene aspect as a declaration (rather than just for free) keeps them from tagging it for free, also making a declaration, and hitting +4 on rolls.   So I find that it protects the fate point economy more than harms it.

That said, of course, the route to taking someone out tends to be a couple rounds of declaration+maneuver, then tagging those 4 aspects, with maybe one of your own fate points, to net +10 to your roll.  But you have to be successful in all of those rolls, which are typically opposed. Because the scene aspects allow you to play off of them with no roll or low difficulty rolls (vs opposed rolls, which may be harder and have more of an element of chance as the opponent rolls as well), this system REALLY encourages them to be used, which means the scene aspect really flavors the scene.   When those players go to describe that fight, the darkness there will REALLY matter in their recollection, because they relied on it so heavily mechanically.  If it wasn't really taggable - if they couldn't mechanically interact with it - then it would be flavoring that might be mentioned in passing during a retelling.

So I also find that making scene aspects a little easy to interact with really lets them shine. It makes them a more important narrative tool. 

Sorry for the long post, I just wanted to make a good case for why you should totally use scene aspects, all the time.

METHOD TO GET RICH
Two words:  Male Enhancement  

It's not against the Laws of Magic if it is not against their will (they are paying for it...)

Careful with that, it might be Transforming another... lawbreaker!

One of my group members does just this, only he sells them potions so that he can argue that they took the potion themselves, thus giving them the "choice"... so they transformed themselves. He also makes it temporary (lasting a week I think?) so they have to keep paying him.. and so it isn't permanent. I ruled it a grey area (due to it not being a full transformation), but really just because I know that character is going lawbreaker anyways...I don't need to be tough on the rules there lol 

The Idea: Supernatural Blackmailer or Locator
Use divination to spy on people, then blackmail the crap out of them.  Or, find Osama Bin Laden and get a reward.

Why it won't work:  Blackmail is illegal, dawg.  Plus, it makes people wanna gank you. And do you think Osama isn't being hidden by magic? Really?

Story Idea:  The group is hired or ordered to find and confront someone accused of using divination to blackmail people.  Try catching someone who uses divination to figure out you're coming...

additionally, the PCs uncover some pretty dark secrets about the people they are trying to protect from blackmailing.  Now it's a moral dilemma: what do you do when you find out the blackmail was about a 13 year old who broke the "no killing with magic" law on accident, because no one ever taught her how to handle magic properly?

On the refinements, doesn't the character have to "column" the skills in thaumaturgy, making a +4 crafting frequency impossible?
You'd be better off stating that the character used that refinement for focus items, and has a magic bullet loader that grants him +4 frequency.   

We have a character VERY similar to this in my game, only he skipped the "magic gun" type stunts in favor of just running as a very specialized thaumaturge (in crafting).  I think he's at +1 frequency, +1 strength in specialization, with a focus item granting +4 strength (2 refinement), and has 9 potions at x2 a day... which he keeps loaded in a variety of old-school double barrel guns.  Technically, he doesn't need the guns, but he likes em.

I'm pretty sure that this is never, ever, clarified in the books. 
Measuring it by refresh seems okay, but which refresh would you use? The PCs level?  Well now if you are submerged every bloke on the street gets 12 fate points?  Man that's a lot of lucky people.  The NPC's refresh rate? Now you've got to know it for every NPC... and honestly I don't.  A subway crashes, and I've got 50 mortals at 2 refresh, 3 guys at 4 refresh, maybe one old guy at 6 refresh.... gurg..

So I just give people fate points according to story.  I give every NPC a single fate point, just in case. If they are above goon level, then I give them two per session.  Then I assign more points as the PCs give them fate points. 

We're up to 7 players, 5 of which use some form of spellcasting.  Avoiding the BBEG in favor of multiple enemies and/or goals gives them different stuff to do.  House ruling some cooperative magic helps, too.  Two wizards casting weapon 4 fire attacks is fun, but two wizards combining for a weapon 8 fire attack is even more fun.   (it also might be a little over-powered, as I just allow them to stack their evocation power ratings together after each paying the 1 mental stress.  But I make one assist the discipline roll, and one control it, which means someone has to pull off a fairly hard check if they do it). 

We have a full wizard, a crafter/thaumaturge, two different sponsored magic users, and a lesser thaumaturge, and no one complains about it at all.  They just decide who handles what and go from there:  For example, someone might focus on saving the babies from being sacrificed, another might focus on the enemies, another will protect the group, someone else might try to disrupt the enemies' ritual, and the last one might go out for pizza. Or veil the whole battle from normies.

I'd allow the law-breaker necro bonus to anything bone related.  For one of my NPCs, i gave him channelling (bone) for this purpose.  Thus, he could do all the normal evoc stuff, as long as he made it out of bones.  Typically, these bones were whatever buried bones were around, which were always enough.    So, his typical block spell looks just like everyone else's mechanically, only he gets a necro bonus to it and bones spring up from the ground and surround him in a swirling blocking pattern.  His attack casts bone shards... ect, ect.

For thaumaturgy, you have in the books: raising the dead back to living, raising the dead to un-living, communicating and handling ghosts... but I don't have much original here.