[Piwoslaw]

Mine doesn't close by itself when turned off, I can leave it unlocked all day on the driveway. It's probably an option that can be (de)activated in the software.

That's a good idea with the spare key, but in this case wouldn't have worked - both of us left everything inside when we got out because we were never more than 2 meters from the car, plus it was in gear and the engine was off (though the computer thought otherwise...). I've pledged to find a place on my body to pierce and hang the spare key on, but I'm not sure where so that it doesn't interfere with sports and other activities. Just joking But maybe having the spare on a string on someone's neck would be a good idea during the trip.