Say goodbye to going to Unity and Blender for map needs! SP2 needs a 'PlanetStudio' similar to Juno: New Origins wherein players can create their own maps through procedural generation or the same thing that is used in JNO's PlanetStudio. Buildings, airport layout and miscallenous stuff is placed under discretion by thr editor's desire.
An advantage of it is maps can be made in-game and enables the game's capability to do so. Due to this, we can make IRL maps and scenarios from our own imagination and in real life.
One disadvantage is probably store price considerations (bah, whatever) and mainly application size which seems to be slightly negligible because our rigs ain't potatoes. Just make it accessible through console.