One of the best features of our '3" is the recently-made-available "Stop" mode, whereby the brake pedal is rarely used. It is always a shock when I drive our "S" and find so much less regenerative braking and have to use the brake pedal. It seems to me that the feature could be retrofitted to even our 2014, AP1, "S." Has anybody learned whether Tesla has given any thought to this upgrade? Is it mechanically possible?