Healz
General
The ability to agree within Alliances to station Forts, Airbases and Radar Towers on the territory of your Allies. This would really help make an Alliance useful. It would also make for a more historic WW2 France scenario, allowing British troops to come in on the site of the French and support them with airbases in various places. I think cities should be left out of this agreement though. Once the number of turns the agreement is for expires, all your units move out back to your territory, and your Allies can take over that Airbase, Fort, Radar Tower if they have the requisite technology, otherwise it starts to decay. Care would need to be taken though that this doesn't become an overkill wonder strategy. What does anybody else think?