Has it got hill-hold-function?
If the slides have some resistance they will not pull the pads completely away from the disks, and wear could be a problem.
I do not agree in that the DSC is causing the problem.
The DSC only comes into action if one starts to go sideways, and brakes every wheel separately.
If applying only rear brakes one need not to be a rocket scientist to predict what's going to happen next...
The tractioncontrol-part of the system is not connected to the brakes at all. It just decreases enginepower, and you see the yellow sign blink right in front of you.
You have a nice and incredibly good car!