Sorry to dig up an old thread, but I have info that might still be of interest to the original poster.
A few months ago, I was interested in similar functionality (
spreading human players apart in multiplayer games) and I was curious if any such mods existed. I remember coming across this thread during my search.
I couldn't find such a mod, so I wrote one myself. komodowaran was correct, it can be done! The mod is now available on CivFanatics
here. It works by rearranging the human and AI starting positions, so that the human players are as spread out as possible.
cyrilp, you were specifically interested in putting online players on
different continents. The mod doesn't have any specific functionality for this at the moment. However, if you play on a Continents map with two human players (
and some number of AI players), it is very likely that the mod will place the two human players on different continents. The mod will search for the most distant starting positions to place the human players, and those positions are likely to be on different continents in that scenario.
If you have more than two human players, it is more likely that some of the human players will share the same landmass - but the mod would do its best to put some distance between them. For example, perhaps one human player on the shared continent would end up on the north end of continent, with another human player on the south end, and one or more AI players situated between them.