Yes policing some game restrictions is imposssible. If you use my favorite definition that with computers "impossible" means "we can do it but its probably more effort than its worth". Actually no-treachery games, and no-diplomacy games, can be policed by use of game logs, backups, master password, and the various DungeonMaster mods such as Watchers. BUT that would probably be more time and effort than any admin might want to put into a game. Particularly since it almost requires that the same person not play in that game.
Also, not to open old wounds, but I think this is part of the reason you wont see some people play in too many games. If their online login has one reputation they dont want associated with their game personae. People in recognized positions of authority or reputations for being friendly and helpful would find it hard to enter into a game. You have people expecting the same from you in the game. And you might not want to damage your online personae even though the idea of playing games is having a chance to be what you are not.
http://forum.shrapnelgames.com/showt...631#post669631