I've got a question about the braking issue myself. I live on top of a hill, and usually descend in "S" to control my speed. Even with the regen brakes working at their maximum capacity, the car still picks up a lot of speed if left in "D" and I would need to ride the friction brakes to maintain speed.

What I've noticed though is to get the Regen brakes to kick in while coasting downhill, I have to tap on the brake pedal slightly. It doesn't feel like the friction brakes are engaging, but the car slows a lot from the generator's resistance. When coasting to a stop from a freeway offramp or for a red light though, the regen kicks in even before I touch the brake, does anyone know why this behaves differently in these situations?

Regen
 

The only thing I can imagine is that when you are approaching your stop, that your foot is off the accellerator enough to activate "Coasting charging" or whatever it is called.