Its not a setting normally available.... its in the system, but to enable it you need to use VCDS to tweek it. One of many I might add, if you read the VCDS thread you'll see your car is capable of all sorts of subtly different stuff to what it offers you in OEM form.
I've never heard of a VW dealer prepared to make VCDS changes, just warning you...
Might be quicker/cheaper to get OBD11 Pro and make the changes yourself