[InsainArcaneBirdbrain]

I think such an addition would be very complex to pull off due to both the logic of using certain skills on horseback, along with how you'd fit the beast in indoor locations. In an idea I threw out a long while ago when I came up with possible promo ideas for fun a while back was to make the riden creature a familiar/summon of sorts that could be recalled/dismissed at will.

The skill aspect could probably be worked around by preventing the use of all non-soldier/rider movement skills. As for how that weakness could be made up, perhaps titles like Fire Emblem could be used as inspiration with "Canto" movement after certain actions. A gap closing and semi hit-and-run base movement playstyle would be rather interesting to see imo.