Im pretty certain a dealer would not be able to do such a "mod".....your best bet is a local VW independent garage or a fellow forum member who has VCDS.
Ken
PS If your ever in Cleethorpes I could do it for you.
Checked an independent dealer £60 
Anyone live north of York happy to chip in
Pay me £30 we will drive over one weekend and you can get all the "tweeks" you want.
Ian
