I've been having problems just getting things to dual wield. Unsure if it's a bug or not, it could be linked to them hard coding no dual wielding unless you have 2 weapon fighting. Again unsure of this but it may very well be what two weapon fighting does. Just lets you wield two weapons, instead of your unable to dual wield at all. I'll have to look into it again, as I'm not 100% sure this is the case. I know it appears to be with rapiers, longswords, and battleaxes. it's the daggers and shortswords that I'm unsure about. think I dual wielded them with Fang Elf, and he didn't have two weapon fighting.