Apologies if I've missed the answer to this question somewhere else, but how do I add more than 18 civs to the bigger maps? I don't seem to be able to do this from the custom game screen. Additionally, is it possible to have more than 18 civs on the Earth huge map scenario?
Well, that just blows my kazoo. I hate messing with the dll files.
Assuming you're on Windows, check the Troubleshooting & F.A.Q thread - there's a link to a compatible DLL there. You can just drop it in HR's Assets folder and it'll work.