The real simple answer is just to not hit the GO pedal when the car isn't in gear.
There are a number of different ways to monitor motor speed. I would imagine the various ways to do it output different information - different ranges of voltage, resistance, etc.
I think that motor-speed monitoring might make a good OPTION for the controller. If it's smart enough, and has enough inputs, why not?
However, it would have to be modified for whatever the input is.
I DO think it's outside the KISS method, but maybe a nice option for later.
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