OK - well - I've enabled some of the things while on horseback - is it enough? I am reluctant to turn it on fully, because it will pop you off to heal, to apply buffs, when you get jumped, if it's fully on. Check it out, let me know if it seems enough - it will pop you off horseback when you're pulling something, or a party member or you are in combat, now.
OK, latest version does everything on horseback too. I see your prob in the battlegrounds - it's not worth blocking it out.