Aah... Lol. Whenever someone reminds me of a large forum, I just think of the EA UK forums. An excessive branched tree of categories followed by an endless waterfall of topics in the end. The categories themselves form their own slightly isolated communities.
But, what would you consider changing? Other than the turn length, I don't see anything that'd make it more adapted to larger forums. I can see things that'd make a difference among different communities, as I can imagine that they'd probably just think "so many rules, what a wierd game" and just leave.