Random Civs on custom map?

[Bruk]

I'd like to be able to repeat something I did with the Civ3 editor. I used to have a custom map of the earth or europe or whatever, and assign starting locations to each of the civs, but I could have more starting locations than actual played civs, so each time I played, I wouldn't know which opponents I'd face. It seems that I have to hard code each of the 18 (or fewer) civs in a modified civ4 map.