This kill switch debate has been flogged before. I am still a fan of a normally open switch that shorts out the ignition circuit. Some electronic ignitions will be damaged by this. However, I still maintain that even then a dead ignition is better than a dead rider. Also, a dead short between a properly fused battery and the power feed for the ignition circuit is going to blow a fuse (or resettable breaker) so fast that I doubt the EI will know the difference between that and a key switch. Why this is not a more popular idea is more along the lines of arguing about a shut-off valve in an oil line. But running a voltage sensitive circuit through a switch cluster on the handle bars is really a funny idea.
Russ