It would be very helpful in the diplomacy screen to see how many turns are left, due to ideology, a civilization is free from declarations of war.
It would also be good to see our faction's ships restricted from entering a faction's borders that we do not have an open border agreement with. As well it would be good for the AI to be much less likely to send their ships into opposing borders. Right now ships cross borders without problems. The only negative reflected in diplomatic relations which seems to change nothing in the game between factions.