Ok cool... I just want to help it become a nice furniture piece here - not pick apart the work put in
If this is another intentional feature, let me know!
1.) Put the mount on the hitch.
2.) switch item button/slot to another horse.
3.) get on and then off the second horse (currently in slot).
4.) grab horse from hitch.
I've noticed two problems that arise at this point - the 'eat' animation does not play when a horse is prompted to nibble on a bush/bomb (or is this just disabled in general?), and the button that displays the current horse does not show the horse that was taken off the hitch EVEN THOUGH if you jump off/on/off/on the horse, it has replaced the one that you switched to in step 2. This could probably be thrown into 'minor tweaks' section, but we were talking about the hitch here