Numbers of key you can have

[Hummelshøj]

Hi.
I own a Astra J GTC 2.0CDTi 165 Sport Eco.
 I have 3 keys for my new car. But the dealerships tells me that only 2 of them will be recognized by the immobilizer as it can only hold 2 keys..
I think that sounds odd that it is not possible to hold 3 or 4 keys..
As I remember the Vectra C could hold 4 keys..

I had a problem with my front p-sensors, they would not turn on. The dealership have fixed it, but now my cruise control dosen´t work.
I can turn it on (white light) but not engage (green light) 
Anybody that can shed a light to what the "monkey" mechanics have done.. I of cause need them to make it work again..

Thanks