Ignition Interlock/lockout problems of the 2018 Volkswagen Passat

The vehicle can be turned off while in drive, and gives no extra signals (beeps, flashing lights, etc. ) with the exception of a brief message on the dash and single ding (same ding for door open, and other low importance messages). The vehicle will then roll until the brake is applied or it comes to a rest on a flat surface or against a pole or hard object. This is a significant safety hazard that has occurred to me 3-4 times, the most recent was today when the vehicle rolled backwards down my mothers driveway. Crossed the street, entered the neighbors driveway/yard, contacted the mail box and came to rest in the front yard. The vehicle rolled approx. 200ft. The vehicle is equipped with auto braking and parking collision warning, that are capable of sensing a collision while driving and notifying the driver of objects while parking. The same system should be able to prevent a car turned off while in drive from rolling uncontrolled and striking a person or object. In addition the car should have generate a significant audio and visual warnings to the driver, furthermore the car should not be able to be turned off while in drive. It’s a fundamental flaw that it can be turned off, drivers door opened, driver and keys step out of the vehicle with no response from the vehicle.