Anyway a lot of people are talking about duel wielding which I hope gets in to some degree. Ok so what if there was power armor developed that added another set of limbs to be specific two more arms so you would have four. That means with this armor you could quad wield single handed weapons. The way I see it we have the technology now to make robotic prosthetic limbs that run on nerve impulses now, and if say the brother hood got a hold of that and added it to power armor so that extra set ran with your normal functioning arms you could fire off four guns at once and bring the pain. It would at least add some more challenge to a fight enemies who have it. I guess to balance it maybe you can only use one handed weapons and the armor class can be lower. I think fallout might have also mentioned this with you growing extra limbs but I figure an armor would be better cause then it wouldn't look so odd with other armor with mutated extra hands, and it think it would be hard to do to begin with.
Also I was watching Total Recall and wondered why we couldn't get something like the hologram device he had in that. Basically when used puts out a combat decoy?..much like the one we have seen in Bioshock one and two. Basically sets up a hologram decoy the enemies attack so you can flank em or something.