I don't really know if the forum is big enough to split OT up into sub categories. Seems it will just be more cluttered. As it is most things stay on the first page for at least a couple of days.
I'd sort of go for:
Admin stuff: sub forums - Welcome to the Forum, Testing Forum, Announcements
Cricket Chat: as it is now, perhaps with one sub forum for coaching/equipment
Off Topic: new, politics, music, movies, general discussion, all in the one forum
Other Sports: soccer, rugby, AFL etc sub forums or threads, either way