It wouldn't make any sense to place Docking systems by default, for the following reasons:
- Not all airports have them in real life
- There are many different kinds available
- Most of the time, they are placed flush to a terminal wall/window, so they require to be placed individually, since GSX cannot possibly know about the actual shape of buildings, especially on 3rd party sceneries, which can use so many different methods to create 3d objects.