[cRiPpLe_rOoStEr]

Originally Posted by Smokeduv

My car has an push start/stop button and although I don't use it as a killswitch, it can work as such very well and quite fast. Of course, it's not as fast as a killswitch because you need to press it for like 3 seconds in neutral or with the clutch fully depressed. When you start the engine back, you can just press the clutch and push the button and it starts very fast, even if you use it to turn off the engine at a red light. I don't know if it works this well with an automatic gearbox and/or handbrake, but with a manual gearbox it does the trick well. I even jumpstarted it and the car didn't make any strange thing, but sincerely I don't want to do it often, yet :P

The clutch might work as an interlock to prevent the car to go forward unintentionally while starting on gear. In an automatic it's usual to have the interlock at the shifter, starting only when it's either in Parking or Neutral.