ok, i'll pipe in on that.
you're purposely mechanically-overloading the drive-train to definitively "kill" an engine that wants to keep running, how good could that be?
with a switch, all you "kill" is an electrical charge, depriving the engine of an element it needs to keep running, so it "dies" on its' own.
personally, i don't have the bucks to replace clutch plates and who-knows-what-else because of undue stress and extra wear & tear.
i just hit my destination at speed, pull & lock the clutch, coast into the parking lot at idle & hit the switch as i roll up to the front door, now that is cool to see & hear, i bet 8)
that help at all, sherryc8641?