Alot of new cars have something similar. Im sure my friend has or had this in one of his new fords.
Doesnt it just join up the interior welcome light to the wiring for the side/rear lights (1st turn on the headlight knob) ?? Doesnt sound too hard, but im sure it cant be as simple as that? If I could be bothered I would try to do this myself It feels good walking upto the car and the lights coming on before you even enter. Nice mod.