I have recently bought a 2011 Audi Q5 3.0TDi. The vehicle has keyless entry with push button start/stop. But it does not have automatic start/stop when stationary (stopping at traffic lights, etc). I would have thought that if it has push button start/stop, then the auto start/stop would just be a software setting and could be activated in the Green menu. Is it possible to activate the auto start/stop if the vehicle was not originally delivered with that function?