I didn't pay extra for this. I paid extra for the WHOLE car as I got the touring model V-6. :-) It already has a lot of features that I have no idea how to work. Since this is the last car I will be getting I splurged. It is a 2014 and I don't know if there is a way for the auto braking to work outside of the cruise control. I will have to check with the dealer.
It's sounds like you're talking about adaptive cruise control. That is totally separate from automatic emergency braking. My adaptive cruise control has stop/start functionality, which brings the car to a complete stop and starts it back up, as long as there is a car in front of me to bounce the radar off of. But, that is not automatic emergency braking, which will apply the brakes if you are about to crash into something. It works whether or not your cruise control is activated