[BrianG]

It will be fairly simple to have the servo mod light up reverse and/or brake lights, but it will be missing logic to know when to light reverse or brake lights. As far as the receiver signal is concerned, the reverse and brake signals are the same; the ESC dictates whether to activate brakes or reverse. So, you can make the brake lights come on during braking, but they will also come on when in reverse. Likewise for reverse; they will come on during braking and reverse.