Method - I do this too, but with an added precaution for my cvt transmission.
With autostop engaged, this is my shutoff sequence:
1) Autostop engages, engine shuts off
2) Brake to complete stop, hold brake down.
3) Shift to Neutral
4) Turn the key back one click to ACC
5) Engage parking brake
6) Take foot off brake
7) Wait one second for the car to "settle" down
8) Shift to Park
9) Turn the key to off and remove
10) Exit car
That "settling" of the car is very minute and doesn't matter too much regarding the transmission, but I'm picky
