Resolutions in the United Nations
I really miss how you could vote for resolutions in the UN in Civ 4. I understand it is completely for a diplomatic victory but it would be really cool to bring back that mechanic which would be awesome in single player AND mp.
If I remember correctly, only one nation (head of the UN) was eligible to propose resolutions. Two civilizations would be eligible candidates for head of the UN: the civ that built the UN wonder and I think the civ that had the highest population or something.
Voting against nuclear weapons, forcing open borders, forcing current wars to stop (rejection by the aggressor leading to huge happiness penalties) and things along those lines were friggin awesome!
A diplomatic victory could still be possible: the head of the UN would have to propose a diplomatic victory vote as a resolution. Would be more interesting than a D.V vote automatically triggering within 10 turns of the UN being built.
Would make the end game a lot lot more interesting particularly with espionage back in the game.