Seconded on the different site, unconnected karma and unconnected pseudonyms. Also, it'd be nice if it could somehow be somewhat dissociated from LW... might be useful to have a link to it easily visible, actually, but if there is one it should be right next to a specification explaining the idea and linking to "politics is the mind-killer".

Separately, the idea of retaining a taboo on things like discussing politicians or the like, and restricting it to mostly issue discussions, also sounds useful.