I believe that Chaz is an incorrect interpretation. The Auto open is on approach to the garage and the auto close is on departure.
Honestly, the auto open when you put the car in drive would not be advantageous to me. I would not want to wait for the door to open at that point. I hit the button as I walk out of my door into the garage. By the time I'm ready to drive, it is open.
Also, you do need to be very careful with this feature. The automatic sending of the open/close signal can have unintended consequences. Recently my wife was in her car and in front of me driving home. She approached the garage fist and open it and started to pull in, as my car opened the door, which actually closed it on here.
Since then I've raised the safety sensor to the level that it now detects the car, not just the wheels.