The problem is skills have to follow the pyramid and you'd be losing a skill point to boost a skill....
Unless I'm not understanding.
Let's say I have +5 weapons, I could lower my weapons to 4 (assuming my skill pyramid can handle another +4 skill) to buy a stunt that lets me dodge with weapons rather than althleics. It's not quite as good as it used to be because my weapons skill is lower but it's still better than my athletics...
Is that what you mean?
I could see it useful when you get a significant milestone and your pyramid is shaped in a way that all you can do is pick up a skill at +1.
It's a way to get around the skill pyramid, yes. It's also a characterization thing. If a character is good at using, for example, revolvers, that doesn't mean that they're good at using sniper rifles. However, because the Guns skill applies to both equally, the only way to represent that is either stunts or aspects.
Instead you use it to boost one of your other skills by +2(in a certain circumstance)
I don't know....it sounds abusable if you use it that way. Why take a skill at +1 when you can boost one to + 7. You know?
The other problem is the refresh economy. You could end up with way more stunts than your refresh allows which should normally put you over the tipping point of free will. And refresh is how you maintain game balance too. You'll end up with way more stunts than your 'level'.
It might be abusable, yes. That's why I asked about cost. It might be less abusable if it costs multiple skill points per stunt, or if you can only buy a limited number of stunts per skill this way, or if the price increased depending on how many stunts you buy this way. I'm not sure what would work.
I think you're messing around with major game balance for no apparent reason besides "why not?", which is fine if that's what you want, but I try not to arbitrary mess with rules unless there's a good reason to for game balance or ease of play, etc.
The RAW relationship between refresh/skill points works quite well. I see absolutely no reason to mess with it. And like Taran said, doing so basically throws the whole refresh economy out the window.
Sounds like a min-maxer's wet dream.
I'm doing this because stunts can be important for characterization, but are so expensive for some character builds that you can't use them that way. For example, Harry Dresden should have the Infuriate stunt. It's clearly written for him, it's perfect for his character, but he doesn't have it because he doesn't have the refresh for it, and because of this his ability to piss people off is nowhere on his character sheet, even though IMO it's nearly as important to his character as his Epic Wiseass tendencies.