Mark
CreativeMountainGames.com
I had invited a guy into a group of regular players and he basically did that sort of thing. Never settling on one character until I just told him to pick one and stick with it. He figured he go around me by having his character go berserk in a town and try to get himself and the group killed. I allowed him to die but let him know he wouldn't be rolling up a new one. He was a bit of an ass in other ways, too, so he had already been playing on borrowed time.