Destruction magic - damage scaling with skill level, +spell effectiveness enchants for ALL spell schools
Each spell level (Novice ---> Master) perk in ALL schools to come with its own +spell effectiveness (damage/duration) buff - Novice +20%, Apprentice +40% etc.
Destruction Dual Casting and Impact perks combined; Impact reduced to a 30% chance to stagger
Robes to have innate +spell effectiveness enchants, otherwise there's no point wearing robes instead of armour
Impossible to enchant +spell damage/-magicka cost enchants on Heavy Armour; severely limited on Light Armour
Magicka to regenerate in combat at enchanted rates
Markarth House bug fix please - steward no longer offers me the option
I'd like to see quest descriptions in the Miscellaneous menu - perhaps scroll through list of quest developments
Ability to drop quests - I've got some that I'll never do, but I can't get rid of them from my inventory
Extra hotkeys on Xbox - lots of different D-pad directions
Tweak hotkey assigning for dual-wielded weapons and magic
EDIT: And the ability to divorce your spouse please.