Okay, since the OP asked:
- Revolver rifle (that isn't a pipe rifle with a revolver receiver). Yanno, something like this:
Very disappointed that I couldn't convert the .44 magnum pistol into a rifle by adding a rifle barrel and stock.
- Changing how one operates a scope, something this [http://www.nexusmods.com/newvegas/mods/61026/?] mod achieves. Of course, it should be togglable in the options. For those that want a little more immersion when using a scoped rifle while being able to use the character's peripheral vision.
- Light and heavy power armor. Light power armor would of course, be heavier than power armor, but still light enough to be carried in a pack, with subsequent mods increasing the armor's weight. It would emphasize high mobility over the other power armors, with less protection than the others as well. Heavy power armor would be... more tank-like; slow to move in, but can take a shit-ton of damage before breaking apart.
- Bows. Dear gods, we need bows. Since this game doesn't exactly use Damage Threshold as opposed to New Vegas, the fact that this game utilizes a heavily modified Creation engine, combined with how annoyingly popular the Hunger Games movies are (we can even name our player character Katniss), I can't see why this game doesn't have bows if Bethesda left enough of Skyrim's spaghetti code in.
- Horizontal/vertical thrusters for power armor (jetpack is piss poor, imho); for quick bursts of speed to evade a shower of gunfire, or to boost away from an incoming nuke aimed at your head. Something like this:
Highly doubt any of this would happen, and the GECK can't get here soon enough. Either I start learning to mod, or pray someone would do any of these things (I'd happily donate to those who could make a light power armor with horizontal thrusters).