For the support team group I think we miss formerly agreeing with a simplified decision making process and publishing it on this first post with the recommendations for the new support team members. Publishing them will ease the whole process. We are almost there.
If helps, I track badges through RSS feed.
A generic approach to maintain any group, would be to periodically (yearly, per semester…) do a meeting to evaluate organization, do cleanups, update wiki, et cetera. For instance a roundtable in NethServer conference where non-assistants could also collaborate online.