I cant tell you if its possible, but they would have to reprogram your BCM to disable this functionality. I would suggest that this is *GREAT* security feature to keep intact. It is a nice, passive security measure that will ensure that even if your vehicle is hotwired, it's not going anywhere. I actually went out of my way to get it added to my jeep.
I dont know about the 06s, but you can
check out this article which details how you can add a sentry key yourself. This would require buying a blank (ebay) and having it cut. There are then some steps you can go thru on your own to have the vehicle recognize the key as a valid key.
If you're intent on killing this feature, there are other rube-goldberg like solutions that you could employ - the reciever recognizes the sentry key from a distance away, so you could, hypothetically, just stick one of your existing keys in the dash near the ignition, and it would probably work fine. You'd have to play with it, and for the record, I wouldnt encourage this solution
Best of luck-
Blu