Drawing on the map.
why ?!?!
Maybe let the AI team up a bit more if they're falling behind as well. I'm sorta neutral in a current test game and everyone else is picking on each other. There's like 2 friend declarations out of 22 civs constantly denouncing eachother for god knows what reason.
It would be nice to see the smaller civs gang up (or do it better atleast) to try to protect themselves from being overrun from the powerhouses. Rather than trying to gang up with the powerhouse (since that one have more options to make deals) and then end up being the next in line.
- Better wartime diplomacy, Casus Belli, diplomatic bonuses if AI agrees with your reasons for war and if you terminate the war after achieving your stated objective.
If this is the last piece of work they are going to do on Civ V, an update to the SDK to make it easier/possible to add custom 3D animated Leader Scenes, custom music, etc.
Revolution and Rising States:
The ability for city states to go full civ, or for barbarians to turn into city states and the ability for your nation to split in half when it gets too big/unhappy/different religion/ideology/ect.
War Weariness:
Severely punish warmongers with revolution to discourage runaway civs (they way Rome was split in half, then broken in many city states because they grew too big).