i assume youve got 'drive by wire' controls on your new mk4 golf, i reckon youd need some kind of remap software to allow the ecu to do this function!!!!, i dont think 'vagcom' or any relevant software will cure this!!!, either have to learn a different driving technic or get some one to alter ecu parameters etc, i think you could either get program altered to your requirements or alter brake light switch position (near pedal) which will in turn send a signal to ecu not to allow throttle to work whilst brake on, weird i know but htis sounds the case, have a nosey you mat have to put a switch in the signal wire to the ecu when you are 'racing' to avoid this problem!!!!