Yeah, you will need to upgrade your headunit to the SSV / Calais / HSV Colour LCD model.
(This in itself will require the VIN number to be programmed in order for the Headunit to work).
Next, you will need to source a DZ Climate control module (HCE), and swap this with your existing Single Zone HCE.
Then finally, you will need to fit the external and Internal Ambient air temperature sensors, as well as a DZ Sunload sensor. (Which is the existing daylight/dusk auto headlights on sensor, but with two extra sensors to determine how much sunlight is hitting the drivers side, and passenger side of the windscreen).
You will also need to fit a second blend door motor for the system to adjust the passenger side temperature.
These will need to be wired up to the new HCE module, and once complete, you will have Full (Proper) DZ Climate control.
Another member (MsEnj) has completed this mod to her Omega.
Some more detailed information on this can be found here...
www.carmodder.com • Converting to Automatic Climate Control for the Holden VE Commodore
Whether it is a worthwhile upgrade really depends on what you want from your car.
Personally, cost wise, its not a lot of coin to carry out.
Wiring wise, there is a fair bit to do to get it working. (Its one of the more complicated mods you can do)..
I hope this helps.