I wouldn't be a fan of a Politic debating sub-forum...I mean, the two things you're not really suppose to debate are Religion and Politics. It gets everyone all pissed off about their opinions and beliefs and wouldn't be too good with all the hate and anger that'd be going around in that forum.
As for the IFL forum, in my opinion, a sub-forum would do for now. Maybe have a trial run on it for a month or so, see how it does and if it does well keep it.
My Favourite Fighters
Georges St. Pierre
Mirko "Cro Cop" Filipovic
Mauricio "Shogun" Rua