What about adding passenegers boarding the aircraft or including the aircraft driving around the airport.
In my opinion, adding passengers to GSX would be something that I know Fsdreamteam would create very nicely, with proper animations, and with proper techniques, and would instantly put themselves above AES. Not that their only competition would be AES, but they've got a valuable potential with it.
The only problems I see with it, is that the only time you would really "see" virtual passengers, is when there is no jetway, and passengers are boarding the aircraft from a vehicle. Which is what, like 30% of the time? Almost all flights are with jetways, and of coarse adding passengers inside jetways is impractical.
Also, if Fsdreamteam did animate passengers, having to animate movement for the correct number of people would be tough. How is GSX supposed to tell what size aircraft you have? It would rise lots of complains if there were 50 people boarding a Boeing 777...
Plus, adding one animation for one large group of people for the "passengers" would get very old, very quick. This isn't the case with baggage loaders, because in real life, they really do do the same thing over and over again. But the same movements over and over isn't really a "good" representation. Unless FSDT made multiple animations for every single virtual "passenger".
But who knows, FSDT is very talented at their work, we will have to see what they bring.