I can think of atleast 3 which I can contribute. It doesn't have to be UG per say, but one that isn't accessible to just anyone so that the guide could be googled, and looked up immediately. What would the thoughts on that be?

Could make it done by post restriction, or what not. Doesn't even have to be good posts, but I feel like it'd be better off if some things were seen by people who actually contribute to activity of the forum (also blocks the ability for gaia mods to do some sleuthing)