Boy this makes me think..
Back in the early nineties I had a G62 stinger combo fly away with a PCM radio. Throttle was set to go to low, but not low enough. No damage done except for a totaled stinger but it was a bad situation and I swore to my self that I would never fly again without a secondary kill system. A channel dedicated to a micro switch was adequate back then, but certainly not the best solution. As I have moved entirely into electronic ignition I cant say enough for this guy:

http://www.smart-fly.com/Products/Ignition/ignition.htm

$60 buck and thirty minutes of your time buys a LOT of peace of mind.
For you guys relying entirely on fail safe for your big block, I implore you to think again and spend the dough on this or anything similar.
A couple of milliseconds is all it takes to change peoples lives.

Thanks Jet guys for letting this thread continue here !