Speaking of the different diplo-windows:
Wouldn't it be nice when you always see the same diplo window, no matter if you are contacting a player or the AI? This would mean even more consistency, and when we use the full window, it would be much easier to add new buttons and 'dialogue' options (in the future/ by other mods)!
edit:
(e.g. declaring war on another player via diplo-screen. when using EUI, you have to hold a key while clicking the leader icon to declare war, which is just a workaround for the missing 'declare war'-button. with the large diplo-window this could easily be solved)
I think the lack of leader screens for humans causes this I know some elements of MP trade/discussion pass through the graphical DLL that we cannot control.
G