Use LoL's system, it's proven monumentally successful. Jury by the game's peers, it's the fairest possible way to provide justice in EXACTLY the way the community wants that justice done, jury by their peers.
Sure, they consider anything a troll, that's because it's not just an anti troll system, it's an anti-anything-people-dislike system. Anything that the majority dislikes can get the hell out. What people consider douchebaggery, negative behaviour, anything that brings down the tone of the game, anything that in the majority people consider to have a negative impact on the enjoyment of the game, it can all fuck off. This is why the tribunal system works, it works in enforcing what the community wants in it's community's behaviour. It enforces the type of environment and social behaviour that everyone wants to play the game in.
