My request is petty, and likely echoed, but just to rile s'more noise: Character creation re-customization. Race I might expect to be permanent, and it seems in-game marriage still factors in sex, but I don't immediately see how changing any other feature would impact gameplay.
It's been a sour taste in my mouth since I created my namesake character that I chose a medium height, but didn't realize until afterward that these approximations are based more on Japanese averages, and that what I was looking for was "tall".
So, charge for it or what have you, but allow means to change characters' features. Taking sex as one such, change in-game marriage to be independent of character features.