Is it really necessary?

I mean. The off topic works just fine, right?

True, True. ^

Yeah, I was thinking about that too, but just maybe it'd be better to have the section, and a single thread for every game..

IMO.

May I point out the "Battlefield Heroes" in this fansites name? Though I'm not against discussing other games I think Offtopic would be the place since this site is dedicated to BFH. This is a BFH fansite and not really a gaming community.
I don't think there would be enough BFH players to discuss about other games anyway. If you look in the Offtopic section there is mostly talk about other games anyway. A new sub-forum would be more of a waste of time and space.