If you added a custom reward for say holding a territory for a certain amount of time say 15 turns , that would allow you to build an airport on a fully conquered continent , that would allow you to use it to
1. Move troops at the beginning of a turn (3 uses)
2. Use airsupport to conquer 1 territory ( and maybe the adjacent tiles too ) (1 use)
3.add bonus to a selected territory for a defensive round ( 1 use )
Brandon
2 people like this idea