Just things I'd love to see added into the game:
Houses in every city. I really like both Dawnstar and Winterhold. Can't buy a house in either, though.
More storage types for inside houses. Containers designed for ingots, ingredients, etc.
Better combat controls, something like how WoW keeps you aimed at your enemy, so he doesn't just disappear off the screen by sidestepping.
Mounted combat. Including first person camera while mounted.
More mounts: sabertooth cat, large wolf, etc.
Have Saves stored separately for each character. When I'm logged into my fighter, I don't even want to see my mage's Saves. I definitely don't want to accidentally overwrite it.
Werewolves getting buffed with Detect Life and Instant Transformation and maybe more damage.
No Random Dragons - (has been fixed, though a more thorough one using the CK would be great).
"Clean up Riften" questline, turning it from a Blackbriar thieves outlet into a semi-decent place to live. Would likely feature Mjoll.
Unarmed combat brought back. I love being a kung fu monk.
Have all the unnecessary scrolling in the UI removed.
Versions of Iron/Steel/Imperial armor that are on par with Daedric, because I think they look better.
A questline to join the Light of Stendarr.
A revamp of the later game where Imperial or Stormcloak victory actually affects the world, especially in how NPC's react to me.