Maybe (and it's a stretch) make prices for stuff realistic in a TES universe sense. Like make a potion only cost about 5 septims or a piece of armor about 40 septims. Make the gold you find in less amounts and not in every other container. But still have plenty of dungeons with a boss chest with lots of gold.
Bring back degradeable weapons. I like having battles that end up breaking my weapons and armor. Especially if I end up winning.
Make the AI more intelligent. Like if they see a dead body they go into "search" mode and stay that way until they find you.
Bring back ACTUAL disposition. So certain NPCs will attack each other. (One of my favorite moments in Oblivion was when I was in olav's tap and tack and a bar fight broke out between a mythic dawn sleeper agent and a nord
Make cutting off someone's head a common kill cam instead of a perk you can only get when you've done 90% of the game. Maybe add a (blood and gore) option.
Make dragons a new form of travel. Like the silt striders in morrowind. And make it like they originally planned in skyrim (be able to ride the carriage in real time) the same for dragons, boats and carriages.
That's all I can think of for now.









