The OEM kill switch, of course, is more-than-momentary . . . yet; truth be told, I have never been in a situation where a kill switch was of critical importance, myself (doesn't mean they don't occur).
Jimmie Lynch, of the internationally-famous Death Dodgers auto thrill show, lectured: When an automobile is upset/overturned with the engine running, a better idea than immediately shutting the motor off, is to let it run, preventing combustible mixture from contact with a hot exhaust manifold, creating a fire (from the days when automobiles had carburetors).
He also said, the BEST tires should go on the REAR wheels, because . . . the driver had some control over a front-tire blowout from the steering wheel; none for the rear tires . . .
Guy had some credibility; had been in LOTS of crashes, for fun and profit!
Jimmie Lynch even took Mr. Wiffle, of, "Don't squeeze the Charmin" fame, for a ride:
I digress. Moderators, delete any or all contamination of the website with clear conscience, if you must!