I'm personally of the opinion that we should start to use the new UserID field in our profiles a bit more to be honest to link forum accounts to game accounts so that warnings on your forum account will have consequences against your game account should you not stop.
In one other browser game I played, you basically had 5 chances on the forums before they not only banned your forum account but deleted your game account as well. This also worked in reverse as well, if you committed infractions with your game account via the messaging system it contributed to this limit of 5. I don't recall if there were punishments for hitting 3 or 4 warnings but there should be.
I know it sounds draconian, and it is. But as far as moderation on forums and IRC has ever gone I've always been zero tolerance and do not stand for crap, full stop. And I'm very aware that it may scare people off using the boards in fear of them being punished. But in a similar token it will remind people to be civil and courteous instead of risking getting a warning.
That said, you could use a similar system without linking it to a game account as well, with different punishments for each level of warning. Say a private warning for first offence, public reprimand for second, all the way up to a forum permaban for the fifth.
