That sounds like great diplomacy. Some of the options sound easily incorporated into GalCiv, and I have little doubt that the AI could handle them well.
Line of Sight sharing - Planets only, ships only, all. This one is really cool, and since we know that the AI doesn't cheat and know where everyone's ships are we know that such deals would be interesting. Perhaps the diplomacy script could include relevant information so the player has an idea as to what he's getting:
"My planets can see over 22% of the galaxy, while you're can see 18%. Would you like to openly transmit our information to one another?"
Deals could easily be timed in number of turns, and with ones like that it would make sense.