[Ironhawk]

My thoughts about forums are that you should only subdivide when the traffic in the spawning forum becomes so great that valid threads are being drowned out by the common, high-traffic threads. If you subdivide before this happens you will divert traffic prematurely and cause the spawning forums (and sub forums probably too) to appear sluggish or dead.

As for the Dom2 forums in particular: IMO, while Dom2's complexity might merit multiple forums, it simply does not have the traffic to support more than a general and MP forum.