Having the ability to cycle through 64/Melee/Brawl/Smash 4 PRs, calendars, news, video uploads, etc., instead of having them all conglomerated in the same space would make for some great organization. This could be made easier by making it a requirement to "tag" the players' main games, tournaments, news, video uploads, etc., which the system would then sort them to the appropriate category.
Giving certain group membership from each game the ability to post news would make it easier for us to publish tier list/MU chart/ruleset updates/videos/whatever as they come along. This would have to be appointed by the heads of the group memberships so as to not bug the admins about every little change we need to do within each group (especially the backrooms, which are constantly having members appointed for different things, and projects started/finished).
Ah! Give thread OPs the ability to modify/delete their polls, and mods the ability to modify/delete all polls within their respective forums. I don't know if this has been fixed already, but from last I remember, this was an annoyance for both the staff and normal members of the website.
I'll think about more suggestions eventually, but those are what i can think of right now.