The brakelight switch failed on my 2.5 TDI Quattro recently and I noticed this clutch switch whilst investigating the brake light switch. As I don't have cruise I could see no point to the clutch switch and wondered if I could use it to replace the failed brake light switch as a temporary measure.
I couldn't as they are different, but whilst learning all this (and what a pain moth switches are to fit/set up without breaking!) I had to drive without the clutch switch - although initially I couldn't tell much difference, I had cause to accelerate hard from rest at a roundabout and the car took off like a rocket! I can only assume that the clutch aswitch limits engine power until the clutch is fully disengaged - to give the clutch an easier life and pre vent wear.
I have to admit being tempted to fit an additional switch to the dash to "kill" the clutch switch in moments of madness when all out acceleration is needed, although the thought of the price of a clutch prevented me from doing this!!!
Interesting though.
Ian