This might be set in a control unit. I think that it is actually for automatic cars. An auto goes from "park" through "reverse" to get to "drive", and the delay is to stop the reverse lights from coming on as it passes through "reverse". I have an auto B6, and it does not have the delay. I always see the reverse lights come on when I go to "drive" at night. It can't be doing the bulbs any good.