After reading that we come back around to...(regarding *some* of the work) "Spiner couldn't do that?"
I'll bet in todays work enviroment there is MUCH less leeway in letting a star do his own stunts*. Especially on a TV show with a tight work window. So much like the Captain he portrayed, the days of a Shatner being a freewheeler are over.
*I wonder if some studios are actually contractually obliged to use a union stuntman if a stunt is done.