You want the lights to come on every time a car slows down? So if you have a stick and you coast and downshift, your brake lights should come on? It really isn't much different.I worked on remote control cranes.
They use regenerative braking.
They just dump the electrical energy to large resistor banks instead of a battery.
It is still considered braking.
We are not talking about hard braking here. I use the ipedal most of the time. No one has come close to hitting me yet. You'd really have to have your head up your behind to do so.