in civIII, you could trade workers that were in your capital as part of a deal, anybody else miss this? it also kept track of the nationality of captured workers and (i think) foreign workers were marginally less effective. this allowed the trading back of captives after a war, and since your own workers worked harder than the slaves, it was worth the effort to trade them. i felt it added another aspect to the game that i'd love to see again. i also loved the sacrificing option given in some of the C3C scenarios, where sometimes a unit defeated in battle would become an enslaved worker who could work or be sacrificed for culture! maybe captured workers could be 150% effective and dissapear after 10 turns? or am i going to hell for even suggesting all this?