I'd be surprised if you couldn't activate this through the Car Configuration File. You will need either an ID Tool or Nanocom Evo. I've just looked at my CCF:
Attachment 146373Attachment 146374Attachment 146375Attachment 146376
Ignore as built percentages, it just tells you the percentage of cars built with that feature.
There may well be other settings you need to adjust.
The CCF editing function is a handy tool (but could get you into a world of pain if you stuff things up!)
I've disabled the three flash turn signalling function (just couldn't get used to it); shortened the interior light delay from 60 to 30 seconds, and; removed the leading 0 from the odometer display. Nothing earth shattering, but handy to do.