a rev limiter wouldn't have helped in the event of a missed gear change necessarily
Correct, serious lack of understanding on this thread

A rev limiter, will only work on throttle RPM, and NOT the engine being overdriven, by either missing a gear, or for example, downshifting from 5th, into 2nd, this will "Buzz" an engine, and generally destroys the top end... or worse
All a rev limiter will do, is cut the ignition, at a set RPM, so the engine can't be over revved in normal driving/racing parameters
Thom