I like the way some of the bikes do throttle by wire, your hand pulls/pushes a cable that opens one set of butterflies, the computer controls a second set. You can shut the throttle and it will stop regardless of what the ECU is doing.
The early toyota iTCS had redundant sensors for the pedal and the throttle position, if any of them didn't match it mechanically unlocked a clutch that would cause the throttle to spring shut, there was a cable backup that would give you about 30% throttle with the throttle by wire system totally disabled,