Don`t worry too much about a second or two of starter operation after start up.
(1) All modern (Pre-engaged) starters have an over-run clutch built into the pinion to prevent damage.
(2) You would have to have an over ride to your auto system to allow starting with the key anyway unless you want to make a phone call every time you want to start!
You could also use the alternator warning light function to operate a relay to stop cranking when the light goes out.
Colin.
1990 740SE B200E/M47, remote C/Locking.
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