I tended to use the P setting but became wary. There were reports of damage to a pawl in the gearbox due to "settling" of the car causing some movement and stressing the components. Also perhaps putting into P before the car was fully stationary. I found this settling down more prominent on hills as the slack in the gearbox was taken up. Stop the car, handbrake on, P mode is the sequence I use if stationary for a longer period( how long is open to interpretation). Otherwise happy to hold on the footbrake to prevent the natural creep. I wonder if the lighter Morgan causes this creep versus heavier BMW cars.
Some advice on BMW sites and youtube also on when to use P mode. Holding on the footbrake for short periods was the advice and using P mode if stationary for extended periods. Based on the gearbox being designed to be held on the footbrake.
I've driven autos in the past but test drives for manual v auto Plus Four made the auto a no-brainer. Paddle shifting gives manual whenever you want it. Auto to cruise. Kickdown in auto in normal setting is impressive! Sport is great for overtaking with the nudge of the gear lever but Sport+ not needed.