I have thought of installing a solenoid in the electrical system main cable , with a big red panic button, or a morse cable that would go from drivers area to the master cutoff switch. There is a huge safety advantage in being able to shut down the electrical system from the drivers seat . The other advantage is i would never have to unbuckle to turn on power when i forget to do so before getting in the car. That and making sure ALL circuits are properly fuzzed. If the button or lever are right in the shifter area, power could even be cut before impact, if the driver is quick. That would greatly reduce the chance of fire, or run away due to a stuck throttle. I had a throttle partially stick open in the traps once. Luckily i was at BIR in Minnesota, which has a very long shutdown, being a part of a large road race course.