If you want the door handle lights to come on I believe you need to push a button on the fob. Unlock does it. Don't know about the others.
As for power trunk closing, that requires a motor. You may not care about weight but every decision made is a compromise. The ATS objectives and marketing put performance high on the list. The car's low weight is accomplished by looking hard at the tradeoff between weight and convenience and cost. It probably did not makes sense for them to raise the cost of the car by using lighter materials in many places and then add a heavy motor.
Its always a good idea to make sure any car you buy has the features you want before you buy it. If you would not have bought the car if you knew it didn't have power trunk closing or door handle illumination just from the fob being near, you can see the value of not assuming that your particular wants coincide with the choices the designers made.
While I support any and all options, manufacturers seem disinclined to offer many options other than in packages. I would have been VERY annoyed if my ATS came with power trunk closing or I had to give up other things to make sure it didn't have that feature.
