Read about the thing in www.civfanatics.com site and it sounds very cool.
What do you think, could something like that work in GC2 too? I know DA will bring new stuff to diplomacy, but I think now is the right time to discuss these things, maybe SD can get some new ideas.
In my mind if a civilizations military is crushed totally, the civilization should plead for peace and become a vassal civilization for the stronger civ. Ofcourse it would be up to stronger side if he would like to oblitirate the enemy totally or accept the surrender.