Coming home lights (where you switch off the ignition, flash the full beam, and open the door and the lights will stay on for 30 secs or so) can be enabled via vagcom. Should be already enabled on any models that were SE and above I think.
Leaving home, where the headlights come on when the car is unlocked and it is dark, is unknown. I have auto wipers, and therefore the rain/light sensor but I do not have auto headlights, and enabling leaving home in vagcom has no effect. So i can only assume that the auto lights functionality is needed too.
Now as to whether auto lights could be enabled by simply buying the auto light switch and enabling the feature in vagcom is an unknown. At £100 quid i don't fancy buying the swtich just incase it doesnt work.