Basically:
Two weapons slots for each hand.
You can switch between these two weapons separately for each hand.
You can toggle using whatever is in your right hand with both hands instead.
It gives room for a fair amount of freedom. You could even have two shields out at once, for example [use one for blocking & the other for smashing]. It also allows for quickly changing between playing styles, like switching from sword & shield [close range] to a bow & a wand [for spells, long range].
What're other peoples feelings on this?