Uh, the problem with stuck accelerators isn't that you can't get the car to slow down. I'm sure that's possible in the Tesla too.

The problem is that by the time you've reacted to the sudden unexpected acceleration and found a way to get the vehicle to stop, you may have already crashed or run something over or something. This is true on your car with a physical transmission as well.

This is all assuming that the brake overrides the accelerator (which it really really should, especially on an electric car where it's all computerized).