re: Cowing's reason for coming to uninHabitable Zone
Read Tom's post. Your request for some sort of indicator is just plain stupid. Why I would support it is beyond me.
As for your challenge: there was no system - explosive bolts or otherwise - for separating the crew compartment from the rest of the vehicle on any space shuttle orbiter.
As such, go research to your heart's content. Hey, there's a thought: such deep and pointless research would take a long time and would certainly keep you from posting your nonsense here.