Thanks your right on. I just got the car and was trying things out in the drive way. I just took it around the block, works as you described. in my other cars, it turns off as soon as you take it out of reverse.I don't see it as a problem... Helps me line up past the garage door. When you pull your emergency brake it goes off. Pretty sure it was designed that way. Once you hit a certain mph it goes off as well. So is yours staying on after you pull away?
Same is true in my '14 GT.mine doesn't go off until i hit like 3-5mph in 1st