Love the ability to use the app to pre heat the car or set up a schedule.
But a neat feature would be a user option that based on a user selected external temperature the car would offer to pre heat a set delay after switching off the car.
I've you go shopping. It's cold outside like 4 degrees.
As you hit the power off button it pops up and asks if you want the car warm in a user selectable choice like 30, 60, 90, 120 mins.
Nice and simple.