Agree on the annoyance of only being able to check tire pressures when car is not running. So this one is somewhat covered in the owners manual, regarding the automatic shut off of the car without pressing the Start/Stop button. Unbuckle the seat belt with the car in Park and it shuts off. Here's what happened to me though. Stopped at a traffic light with car in D, unbuckled my seatbelt to get something, took my foot off the brake to go and car shut off. I think this is covered in the owners manual somewhere which I don't have access to at the moment. This seems a little sketchy to me.
You're correct, as long as
Intelligent Stop/Start is activated and the
auto stop has kicked in, unbuckle will shut down the engine.
This is documented somewhere around page 122:
"DRIVER EXIT
Note: The Driver exit feature is only available when Intelligent stop/start is enabled.To prevent the vehicle from being inadvertently left in a driveable condition, the vehicle will detect when a driver is not present, and automatically switch off the ignition system..................."
One of the conditions is:
"The driver's seat belt is unbuckled"