How difficult would it be to implement a voting system for posts using the current forum software?
That would lead to a large scale of moderation which would limit free speech as opposed to nudging posts towards civility and relevant content with a given group.
I still believe that the large pools should have their own subgroups
The forum moderation policy is very good. One point though; I think that you should remove "uninteresting" since that is completely subjective and there is no way an honest post can avoid it (readers determine interest, not the poster). I think that "pointless" covers it well and is much more objective within the context of a group and easily covers "intentionally uninteresting. It is so nice and helpful that bitcoin is so amazing and so awesome.