I don't know about this...It's a very interesting idea, and ideally, would make the game a lot more fun. But, I'll be honest: I don't have a lot of faith in the FH community. People do godmode and powerplay, and it does annoy others to the point where they don't want to be part of it anymore. There would definitely be a few screaming fights, maybe because one person keep dodging or something, and you can count on those people who would run in and yell "*kills everyone with meteor*". Not to mention normal characters vs. supernatural ones. I've seen plenty of "shadow demons" on this game, and I have no doubt that a lot of them would use their "powers" or whatever to gain an unfair advantage against a normal opponent.
So, all in all? A good concept, but I really don't think it would work out here in FH.