Yes I have that on mine, and its in my 2008 manual. I also need a spare key though. I don't think you can just buy a spare and have it reprogrammed. Be pleased to be proved wrong though as it looks expensive!
OK, need to correct last statement I made. By curiosity I did quick check on polish alfa romeo forum(alfaholicy.org), and in short it is not that easy I thought. Yes, MES has option to program in new key, but only theorethical -in practice that does not work on 159 as far as other forum members said
There was info that Alfa OBD works better, but after whole procedure only immobiliser works OK (you can start engine), but you can't get central locking to work - for this as emergency solution easiest option is to get the mechanical key copied somewhere and open manually the car.
But, the guy who developed DPF monitor (I think it is the sam guy, and on AO forum is under ECULab nick), last year sorted out the way how to program any used key, and allow full functionality. As far as I know he charges around EUR150 for this service (and you do not need key code card), but the car needs to be left with him for one day, what taking into account fact his workshop is in Poland, won't be any use for most of you guys. The other option is to order through AR dealer - in Poland, new key cost is around EUR300 + around EUR50 if you do not have code card (which needs to be first obtained), though there were reported cases that some dealers mentioned EUR700 for that service for some reason.