Mark
CreativeMountainGames.com
Go to it, Morrus! Best of luck with all the work involved in making this place better. I think you are right to tier the sig abilties, including being able to turn them off only as the highest tier. I'd stay away from the allowing people to change one anothers avatar or custom titles since that invites the type of confrontation (essentially name calling through words and pics) which usually is the most difficult of moderation duties. The posrep-only system seems to do well enough allowing people to express when another EN Worlder is being helpful around the boards and the lack of negrep has proven to avoid pettiness and the same type of confrontation that I've already mentioned. Keep up the good work and I look forward to seeing the additional changes. Thanks! 
