Not a car, but I've got a bicycle light that does this. Turns on when it's dark and also when you brake. So definitely possible
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I always wanted a similar system to what you see in racing video games, when they display input controls. A red and green bar on the rear of the vehicle which shows accelerator pedal position, and a red bar which, in real life would have to show deceleration, as a percentage of theoretical maximum, rather than pedal position, as in the games.
I've driven rentals that put the brake lights on if you did not have a foot on the gas, and only lit a 3rd brake light when actually pressing the brake. Dunno why it isn't more common tho.