A bank would be nice. Like, the banking system in Daggerfall was cool, but then, if you don't pay your debts in time, then the bankers would send mercenaries after you!

Also, maybe crossbows would be nice, like if they could be launched further but took longer to be loaded and such. More random events could be nice, such as an old man wandering the road, and when he sees you, he takes off his disguise, revealing himself to be a mugger of sorts. More cooking options would be welcomed, as well as a skill tree for cooking. The arena should make a reappearance in a later DLC, and there could be an underworld system. Maybe you could get into shady card games, as well as start your own Skooma factory. Assassins from the Dark Brotherhood could take a stealthier approach, such as hiding in a bush and shooting at you with an enchanted bow before you even know where they are, instead of just slashing their way at you and getting slaughtered immediately.
