Improvements on Diplomacy

[MatMat]

I think civ 4 ought to have a more advanced diplomacy system 'cause the one used now seems to be a bit unreal.
For example, in civ 3 the A.I don't tend to trade cities under normal situation, but you know in the real world it's vice versa! So in civ 4, the weak countries(A.I) should give away cities in order to save itself! Also, the A.I should demand territories from you rather than tech!
Another thing that ought to be improved is the units preferences of the A.I. I found out that in levels under Monach, no matter what the A.I pre-set preference is, the A.I tends to build defensive units! So civ 4's civ be stick firmly to the pre-set build preferences!
Thank you for your full attentions and please feel free to give replys and corrections!!

 

[rhialto]

I'm not personally aware of any historical situations where a country has voluntarily ceded major centres to save itself. Allow trading embassies that dominate the city economy, yes. Have the territory ceded for them by a third party, yes. But actual outright ceding, please enlighten me.