I mentioned this in "weapon ideas" thread but thought more light needed to be shed on the subject. F:NV needs duel weilding guns! It was something that has been in every one of the fallout games until bethesda took over the title. I found myself in F3 storing all pistols and the Smg because it wasn't worth carrying them around. A duel weild option would change that. Coming back to the comparison i made before and i'll say it again "which would do more total damge? a plasma rifle versus two plasma pistols." Not to mention the some of the concept art i have seen for F:NV which features a female character holding two plsama pistols.
So im going to just put it bluntly, DUEL WEAPONS IS A MUST SEE!