I've heard that late-model Range Rovers have a feature that automatically disengages the fuel pump and unlocks all the doors in the event of anything that triggers the airbags. If this is true, does it actually make a difference in the event of a crash? Anything severe enough to create a fire danger (fuel pump) and/or require outside assistance to get out of the car seems likely to bend the door frames, rendering the locks pointless. If I'm wrong, and this is a highly useful safety feature, why is it only available on high-end luxury cars?