I'd like to see something built into the restoration magic that would remove the arrows that get stuck into my character for quite some time after a fight.
These need to be tweaked/changed:
-1st camera available for Werewolf and Horseback riding
-Werewolves need to have more health, or at least more damage resistant. NPC werewolves are resistant to frost
-Changing into a werewolf in the companion's guild needs to not have them kill you over it since they are werewolves (well some, but still those ones shouldn't attack you)
-Changing as a werewolf in a city and receiving a bounty should have them react to you in some way even if you pay off the bounty (TES3 had people screaming from you if you were discovered, but maybe not that drastic)
-What happens in the Dark Brotherhood plot needs to be recognized in more plot lines
-Vampires need improvement
-Groups of joinable Vampires, like Morrowind
-Destruction magic needs improvement
-Magic Regen rate needs an improvement, I shouldn't have to use console commands to make magic even slightly useful during combat
-Dark Brotherhood Cowl doesn't have the mask on males making it have no difference to the Maskless version (which is supposed to be the on without the mask)
-NPC Death animations need many tweaks
That is all I can think of right now