I think it would be more of a hassle than anything else. You could have a button that completes the ignition circuit mounted where the clutch pedal touches the floor. You would need to tap into the wiring of the ignition circuit and then find a button/switch that would work and mount it. I personally wouldn't let anyone borrow my car if they didn't know that the clutch had to be disengaged when starting the car whether it will actually start or not.