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Momentary kill is good, but I would like a switch like used on PWC's, that kills when pin is pulled or maybe even a switch on the handles that has to remain pushed to keep it running, mine are in regards to safety related issues.
I like your ideas.Had my old jiffy stuck on full throttle once while drilling a hole. I sliped and let go of it and then it was stuck on full throttle.The starter rope was swinging around fully extended so I couldn't get close enough to shut it down.It did die on it's own after a minute or two.I haven't had that problem ever again but it was interesting trying to figure out what to do.