Hi, I am having the same issue, a rattling noise (sounds more like a slightly blowing exhaust) from my 2007 GTI DSG when the car is stationary in D, M or S with my foot on the brake.
I have only had the car for two weeks and had to have the fuel pump replaced under warranty as the car died as soon as I picked it up!
However, I understand that the vibration issue is common in the GTI with the wet DSG 'box.