I tried to create a script to simulate trashy drivers and small stuff droping off vehicles. As result the tiny bottles collide with the car and, after dissabling collision with car using (disableCollisionWith-command), still with wheels making the vehicle movement very clunky. Also the driver may die suddently.
Similar problem can be seen with parachutes and choppers, where the parachute may stop instantly the chopper.
Video:
http://www.youtube.com/watch?v=3nTd7qisslg {F20732} {F20733} {F20734}