I don't know about anyone else, but I really miss the immersion of being able to ride in first person.
I also miss riding in first person. Would also be nice if you could at least maybe pull a bow or single weapon/spell out. Maybe not a two handed weapon/spell but something would be nice. Maybe a skill tree for combat while on horse back? I know i could imagine some fairly cool horseback combat animations, although I don't have the skill set to produce a game.