Well, when it comes to melee, what I had thought ages ago was using two mice (if possible) , one for sword, one for movement/shied etc, there might be room for gestures. It may not be super ideal, but hey anyone can easily get two mice, no need for special equipment for a game.
This has nothing to do with my post xD
If my idea was to work, and be produced. (Not happening Lololol)
You wouldn't need a mouse, Your arms would be holding the shield! (And the sword)
Still pvp would be a pain, So you would have to make 2 huge ass rooms lol.
Ill see if i cant make some photo's later.