Yes you are right but instead of the parking sensors and the alarm (you dont need an alarm, a good theif will have deactivated the alarm and stolen the car long before anyone noticed) you can for example get the sunroof for free and save yourself 300 euros!! Thats what I did i told pazaropoulos instead of giving me the alarm and sensors (things i dont want) give me stereo (in your case the sunroof) for free and they said yes.
I'm going to negotiate and we'll see. Beside the fact that Tsokas is near to my place, it's the only dealership (i have been to Sirakakis and Tolias) which provides me with a car until my 500 arrives. Moreover, Tsokas group offers free service for 5 years and i consider that as a good deal.