Auto-close when backIng

My backed my 2011 SHO out of the garage and the trunk was still open. She swore that it closed on its own. We also have a Flex and sometimes I leave the lift gate open and start backing up.

It would be great if the trunks and liftgates automatically closed when the car was put into reverse. They would emit a chime and have a delay but that would be a nice feature.