Good way to do it safely but it would definately encourage people in attendance of a rally to do stunts.
I hate on stunters because I've never seen one doing it safely or in a controlled environment. It's almost always in heavy traffic without signalling or care around the cars. When they start doing it in empty parking lots or not on the freeway then I'll respect them.
When they come out with a stunting videogame I'm selling my gsxr.