Oh, okay, I do have a third issue that is arguably backend-related:
The way people in different games (that have a different flow rate of questions) compete for the same rewards, so an meh expert on D&D can quickly get to 10K, but an expert on, say, GURPS, or on [tag:rpg-theory], will have to wait years and be at the mercy of D&D experts when it comes to stuff like closures-and-openings etc. IOW I would like privileges to be linked to tag-badges more.