and what we have seen of the blackstaff in
show us that it might not be an item easy to handle.
as i see it: all the rules as written in the rulebook are the dresdenverse - you and your group of players are allowed to deviate as much as they like from that set of rules, but then it's not the dresdenverse in the sense jim intended it. not that this is a bad thing. when i read about mostlyawake's game where the necromancers summon hordes of zombies before breakfast I thought, "sounds lik a hell of fun", but I would not imagine the dresdenverse that way.
as with each rpg, every rule is optional and people are invited to make up their own, no need to argue about that, but with each step they put more and more distance between their game and the way it was conceived. every group has the right to play their style. it's the same like "hey, I heard you are playing a last airbender game with the DFRPG? stop doing that, it's not the dresdenverse!"
last but no least: my take is on the laws is: most laws (like killing) apply only to mortals, if you kill vampires there's no lawbreaker. there are lots of ways to circumvent breaking the laws (like doing holographic illusions insteand influencing the mind of people to see things, using weapons). if laws are broken the powers must taken immediately and apply to the refresh rating. be honest, if there would be any problem, we GMs have enough power to find a way to make things possible. (I intend to give a player the living dead power for a while, as he dies and will be resurrected, at that milestone all players get 1 refresh (end of a story arc), but he gets 2. end of that story arc when he gets back to real living others get 1 refresh, and he loses living dead and this refresh is free for other stuff. in the end everything is fair for all.)
and I like have my players a bit uncertain about that free will/nature thing. for some it's the attraction of the game, of playing a changeling, who loses himself more and more the more he uses his powers. i know a lot of players who like to think around the corners to avoid losing humanity, gaining lawbreakers whatever.
it's part of the thrill, knowing you could end the whole problem here, by blasting the bad guy to hell with a lightning bolt, but you know you shouldn't.