Ok, maybe better to post in this topic than to open another one for my wishlist.
1. Bring back the old good tribute paying.
2. Bring back the option of asking an AI player to attack another AI, and make a new option of asking an AI player to make peace or alliance with another AI.
3. Make history maps of players' cities and borders, like it was in the original game.
4. Make a new type of political relationships, called "Federation", which would be an enhanced alliance, with sharing some resources, like research, economy, political state with other players, wonders, etc.
5. Make a new type of political relationships, called "Vassal", in which the vassal player must follow your orders.
6. Make it more easy to sign a peace after war.
7. Make a new feature called "Ethnic Group", in which every nation will be related to its ethnic group. So, when you build a new city, all citizens belong to your ethnic group. But, if someone else captures your city and grows it up, then new citizens are from their ethnic group not yours. Ethnic groups in cities should affect peace in that city, depending on your political relationship with their original nation.
8. Make cannons, artillery, and howitzers can attack ships, like it is in real life. Make vehicles can't move through forest, as they actually can't in real life.
9. Make diplomats and spies cannot bribe bombers if they are in the air, as it is too funny.
10. Make military losses affect their city population, as we must be aware what happens when people die in wars.
Please.