Someone needs to do a mod for this, it's one of the few major improvements that Civ5 brings, and it needs to be there in Civ4 as well. Of course the AI would need to be edited to understand the new concept. If you lose a resource and the cap is reduced, I suggest that nothing happens to your units, but you can't build new ones. I also suggest the cap be set to 1 unit per resource and 8-10 resource per pasture/mine/well. This would add so much strategy when setting your war goals and forming your army (no more tank stack of doom, you'll need to use infantry and other units as well), it's also realistic. Spoiler : Also, I'd like to know if there are mods for the following: -mod that let's you trade gpt for gold with the AI(the equivalent of loans, can be done in civ5), and it should also let the AI offer gpt even if he has negative gpt at the time. -mod that let's you trade cities when making a peace treaty (no idea why this is forbidden in the first place, it's realistic and it lets you exchange territories you don't need) -mod that let's you gift cities to your vassals (very annoying when fighting a war for them and you're forced to keep the cities you take, or when someone capitulates to you and you cant give them their cities back) -mod that makes vetoing give reduced or no unhappiness penalty, or perhaps only a relations penalty with those who voted yes Would someone care making these? They're all just a couple of lines of code.