Forced specialization of ranks is the option most chosen by other games, and likely the one easiest and most capable of being balanced for PvP. Besides which, IMHO, it's the best way to build anyway: trying to build a jack of all trades never works well in Arctic. If you want a basher, you stat for damage/bash, but your hps end up going down quicker than my ex-wife when I went out of town due to lack of apply/limdam/etc. At very high end play, these necessities become less well-defined, but balancing only for the top 5% of players is one of the elitist issues which have dogged this mud for decades.