Remove horses as an item but add them as a gender. You will be able to play as a horse and you will have to buy your own armour, hay, and maybe even additional packs of ammo for your rider. Completely autonomous, sentient horses would change the gameplay of cavalry drastically. Riders would have to look for horses willing to mate cooperate. The best and most famous alpha male riders would get the best horse players, the worst would get the most disobedient horses and so on. Killing your horse after getting off would finally count as a team kill.