I wasn't suggesting that the car shut off immediately when the fob goes out of range. You should be able to set a timer for that function so you can leave the car running if there are people in it, for example.
For example, if your fob can connect to the car when it's in your driveway and the car is not locked, someone can get in and start the car, right? However, when the car is in motion and gets too far from the fob, it should warn the driver on the dash board and then eventually shut the car off. Look at what happened to that guy in Atlanta. He left the car running and had the fob in his pocket, 4 kids jumped in and drove it off and he ran after it trying to stop them. If the car simply stopped running when the fob got too far away, he could have just stood there and waited for the car to roll to a stop.
The car is pretty quiet when idling especially if you're a bit hard of hearing like me.
Also, I didn't hear any warning tones from the car as I walked away. Why doesn't it use the car horn like the alarm system when you walk away with the fob and leave the car running?