I would have to say I agree with everything listed in the OP, and I would add some to it.
That's about all I can think of right now, but it's probably not everything I could list for what I'd want from another ES game. If any of these have already been listed, I apologize to the people who put them out. I didn't read anything past the OP before typing this up.
Yeah, mechanically you'd think it would just be a copy/paste sort of job. They already did the work, why throw it away?
And another neat thing I think should be added would be a legendary skill level, like an ability you get when you max out a skill tree that allows you to go beyond what is normally possible. For example, maxing out Enchanting would allow you to destroy/disenchant Daedric artifacts. Stuff like that. Something to show for being one of the very few people in the world (of the game, not in our world as players) to reach such a level of skill in an area.