I cannot figure out how to get the moderation queue working. Is this feature currently available? If not, is it something that might accompany the recreation of reporting/flagging?
Reporting/flagging is not yet in (there's some planning discussion going on github) but its very likely it will only happen after new permissions system* is in and I'll be free to move on to get those implemented myself.
What exists in Misago currently is that you can enable content approval by moderator for selected categories.
*new permissions system is a massive feature to get in, but I will for sure do the transition to it over multiple releases, each moving other part of Misago from old to new permissions, instead of doing big revolution PR that turns whole thing upside down.