Multiplayer, guns, and duel wielding. (Though I suppose I could get used to duel wielding, I wouldn't be happy about it, though)
Guns? I don't really see the point (after all you got magic.)
Multiplayer int the TES universe would be hard, as everybody would want to beat up the bad guy and be leader of the fighters guild etc.
Dual wielding: At this point i agree, i dont see why you shouldnt be aable to use two axes, but i would put a limit (not being able to use two longswords, but a longsword and a dagger or shortsword, ot two shortswords or two daggers.)