I know this is completely off-topic, but since we're mentioning start-stop, there's another niggle that caused me embarrassment while at a traffic stop recently.
If you remove the seat belt while the start-stop is active, the car beeps and tells you something about start-stop being disabled, and that you need to re-start the car manually. Normally, you move the s-tronic lever to P, press STOP, press START, move the lever back to D and drive off. Unfortunately, the first time this happened, it took me 10 seconds to figure out just what happened (I just removed the seat belt to take out phone from my front pocket) and another 10 to re-start the car. Luckily, there was only one car behind me and he wasn't in a hurry.
The moral of the story: if you need to take out something from a pocket on a traffic light, disable start-stop first!