After a few test, I haven't found a way to enforce open borders on 2 civs... but I may be able to make open border last for hundreds if turns, ie make one at start of game, and let it last until the end...
Sharing vision, that I can make, but I may require a bit of time.
Also small report on features to come with next update that I'm debugging/testing right now :
- The AI will try to heal it's air, naval and land units when reaching HP thresholds (ie : won't attack for land and air unit, wont intercept or sweep for fighters, and go near close harbors for ships/subs, see below)
- Ships will be able to heal not only in the player cities, but also on adjacent plots of friendly cities with harbor, to help fleet management (and the AI, that will try to move it damaged ships near such cities)
- Fighters that are not required for interception missions will go on air sweep mission if needed.
- Some city-states will be linked with some majors civ. example : if Germany does an early DoW on Belgium, and were still at peace with France and UK, then both of them will DoW Germany. Linked CS will also follow peace treaties, and you won't be able to DoW them before the peace treaty is ended.
I'm not sure that I'll be able to add naval transportation and invasion for this WE, I may report v.17 final to next week as this is something I really want in.