Antoine: There is no priority system right now, as there is no need for it at this point. However we will of course implement one, if that is required. Aerofly is not working like FSX used to, so you have to think differently. Using the SDK you can create your own 'sceneries', by sceneries this means either a runway, airport buildings, new aerial images or even a complete city or possibly a big coverage with generic buildings. If two designers decide on creating the same airport or very close airport, Aerofly simply loads both.
We have decided not to address this topic at the current time, as we simply have not that many 3rd party addon developers. Orbx is the first one and we will see from there what else is going to come.
Please keep in mind, Aerofly is an evolving platform, we will always improve and enhance our engine, if there is need to.
The upcoming Orbx LOWI airport shows you what you can do with the SDK. Anything Orbx has done here can be done by anybody else as well.