As it is now, when a civilization is eliminated (i.e. their last city is conquered) all their remaining units simply disappear. This is of course without the "require complete kills" option. My question is: would it be possible to make it so that when a civilization is destroyed, their remaining units become Barbarians? Why not just use "require complete kills"? you might ask. Because that would still require me to go and kill every single one of those remaining units, and who knows where that Caravel is in the middle of the ocean? Or have to make peace with a "civilization" that would not be able to do anything anymore, and just exist pointlessly.