This may be really difficult to pull off, and it's not a serious problem with gameplay, but I've been playing with fast travel disabled for immersion's sake, and it kind of kills immersion for me when I take off on my noble steed, and Lydia has to hoof it trying to keep up. After I travel miles and miles, I turn around and there she is. I keep wondering, WHY doesn't she get her own horse? Anyway, it would be a really cool thing to have companions be able to climb onto a mount behind you, and make a slight but noticeable decrease in the steed's speed to add an extra degree of realism. If you can pull this off you will be a legend in my eyes.
