Its not mine, its just a theoretical question :P And yes, jumping is def. My thing so I'm sure it would be something like around 3 foot IF the horse is able to manage it. I wouldnt force a horse into something they don't enjoy or do well at. And yes to auto lead changes, that would be one of the beginning basics I would teach.
If the horse was a stockier warmblood built thoroughbred who could easily jump high or even was crossed with a warmblood, do you think that could increase the value?