First off its quite minor but bring back the Airbase, and add a port facility improvement. Also need to introduce a "wall" improvement, and get rid of the Great Wall wonder. My simple thought on this is that China was not the only people to build walls across great distances. The Romans built Hadrian's wall and there are a few other instances in history. Also with the wall ensure there was a way to create gate type part of the wall, and with that any part of the wall that was not a gate would be impassible even to your own or allied units. Thats it for improvements.
Next up, It would be nice to have a more elaborate diplomacy system. Non-Aggression Pact, Trade Agreement, Defense Pact, Then multiple empire diplomacy, Alliances, where you would get to pick the terms of the alliance, for instance only allowing tradeing, or full on military alliances and NATO or Warsaw Pact type things.
Next, Provide a way to buy mercenaries instead of building units, it would provide smaller civs with strong economies to fight overly large civs, of course make the mercs able to be bought by enemy civs.
Lastly Internal politics. To begin with obviously you are the ruler with no oversight. But for civs with more democratic civics create a legislative branch, which will present you with choices like create social programs and such, one way will cost you money, the other option cost popularity. Also with this you would need approval for war and changing the tax rate depending of course on which civics you have.
Next up, It would be nice to have a more elaborate diplomacy system. Non-Aggression Pact, Trade Agreement, Defense Pact, Then multiple empire diplomacy, Alliances, where you would get to pick the terms of the alliance, for instance only allowing tradeing, or full on military alliances and NATO or Warsaw Pact type things.
Next, Provide a way to buy mercenaries instead of building units, it would provide smaller civs with strong economies to fight overly large civs, of course make the mercs able to be bought by enemy civs.
Lastly Internal politics. To begin with obviously you are the ruler with no oversight. But for civs with more democratic civics create a legislative branch, which will present you with choices like create social programs and such, one way will cost you money, the other option cost popularity. Also with this you would need approval for war and changing the tax rate depending of course on which civics you have.