You know, this business about not running home... well, it depends. If home is the place where that's the end of the ride and now it's play time - ok, I agree. But I run home a lot. It's a heck of a lot of fun to coming careening into the yard and watching people's faces! :) However, only about 50% of the time does coming home mean that its the end of the ride or end of work, so my horse doesn't figure that running home is much different than running to the bush. Also, she has strong basic training and has never ever not listened to a command to slow down or stop.
So, I'm not recommending that everyone start running their horses home, just saying that, like just about everything else in the training world, things are never 100% true :)