On Pre Facelift cars
If you have
OBD11 Pro or VCDS Then no it is free, you just make
coding changes.
Its been a very long time since I looked at this but From Memory
You can change the settings so its always Red in all modes
You can change the settings so when you go into reverse the lights turn off or change color (never done this myself)
You can change the settings so the door lights flash when you indicate and you can have different setups for left and right (red white or pink)
Again i have never done this but the
coding says you can setup
Control interior lighting by zones from the CAR Menu - it states you can change the lights by area.