I'm not a power user or anything, so maybe there's a way to already do this, but it would be great to customize which sub forum topics appear on the overall forum list.
For instance, if I don't want to see "mods" "clubs" and "JJP" threads, I could filter those out to not be shown, and would instead need to navigate to the specific sub forum to view.
I think this would do away with a lot of clutter, for a LOT of sub forums that aren't frequented topics of discussion for many.