More unique weapons/weapon types!
Crossbows!
Harpoons!
Claw gauntlets!
Pauldrons!
Belts!
10 ring slots like the number of fingers people have, unique rings showing on models!
Wearing normal underclothes under your armor/robes over armor instead of having to change!
Equipment configuration switching (like from stealth to fighting, walking in town to exploring)!
Carrying torches and using stuff in both hands at the same time, or possibly allowing any hand using magic or any magic weapon to act like a torch with cool color shading!
Menus that don't take up the entire screen, better organization for items in bag, more items displayed on the screen with no endless scrolling down, especially for items used constantly!
(perhaps smaller text for item names, with clearer organization of items in inventory tree by item type (weapon/armor/gem/scroll/quest/armory tools/lockpicking and traps/crafting/food/books/potions), category (weapon type/armor slot/skill type), ranked by quality/value)
Loot teleportation... No, talking crab helmet that buys loot!
Your own settlement/fortress that you can upgrade with quests like in morrowind!
Owning businesses and reaping benefits from them like in assassin's creed/gta sa!
Npc's responding to your fame/achievements more often (especially if, say, you are in charge of the mage's guild, and nobody on the main quest even mentions it)!
Crime system based off of witnesses/items actually known to be stolen!
More side quest lines: guilds, becoming king of skyrim, powerful merchant, nordic artifact collector, etc!
Making running speed more consistent from start to end, so environments and combat are more balanced/believable (assuming sprint means that this is in)!
If a compass, one that isn't stupid, or too precise... Can direct you towards roads and general area but doesn't point right at location (you are nearby your destination.)
Survival mode!
Dragon riding!
Romance options!
Shapeshifting into a dragon bird!
Sorry for the caps, was just replying with crossbows and a couple inane exclamations but then I started having actual ideas... by the time I realized it I had already done so much in caps that there was no point stopping it.