Right now, I was looking for a place where Lemmy instance administrators can gather around and talk about being an admin, establishing policies, discuss admin-user interactions, and argue about what the fediverse should be like. There is /c/lemmy_support and the Matrix admin chat, but the format of both of these is to fast-paced and fleeting, and so it is not so easy for future administrators to find the discussions that previous administrators already had.
I think a forum for such discussions would be very suitable in fediBB, because this format does a better job at archiving these conversations. Just a thought!