I want guns in Skyrim. This is what TES is really missing.
Flintlock guns, machine guns, hand grenades, laser blasters, light sabers and nuclear devices to name the least.
Which means we should have appropriate skillset for these - well, light sabers could stay in ongsword skills i guess... Obviosuly, hand grenades should have a skill on their own, unless throwing knives skills is in.
This also means Armour sets should have an additional resistance possibility to the 'elements' laser and nuclear stuff.
I'm sorry, but this is TES, not Star Wars. Hell, what you say might even fit in Fallout, since only the lightsabers would need to be added. but please, TES is pretty much the only decent RPG (read as: there are no decent RPGs that are still set in medieval times) around that hasn't changed because of technology yet (well, Two Worlds 2 made a step in the right direction, but it's definitely a different game altogether)