Talk to your farrier about it, he'd have the best answers for you. I know they frequently use wedges and pad up high trotting Arabians, but since I don't show Saddleseat, none of mine have ever been done that way. Therapeutically, I don't know what they'd be used for, except to change the angle of the foot? While it grew some heel? MAYBE?
I'm like you, my horses are all barefoot unless I need to have a keg shoe put on to go show. After all these years barefoot for normal riding, I'd be less inclined to take a horse that required regular shoeing. Spoiled I guess!