You should ask in the VCDS section, really. When I got mine, I got a cable from an approved supplier and downloaded VCDS from Ross-Tech, which allowed me to look at some parameters but not make any changes (as far as I remember). I then paid a registration fee to Ross-Tech which gave me VCDS-Lite, which allowed me to make changes to some parameters, enough for what I needed to do on my old Mk.2 Toledo, which is not a CANBUS car. To work on CANBUS (as on my current Altea) would need full VCDS.
However, I think the available options are different now, and I've not checked them out properly yet.