You could put thin safety wire and a large handle. Some P-51s and other airplanes had a soft limit on the throttle with wire. Shove the throttle hard enough to

You could put thin safety wire and a large handle. Some P-51s and other airplanes had a soft limit on the throttle with wire. Shove the throttle hard enough to break the wire and you get more power, but so much that the engine needs to be at least inspected before it flies again. In this case, it would probably stop someone from making a mistake but you can also kill the power in an emergency.