I'm trying to set up a game with a some friends, and one of them has a Mac. Is it possible to include that player? We were thinking maybe we could manually pass the save file to the Mac via DropBox when it's their turn.

Just wondering if you can use GMR to take turns offline? I'm imagining something like this:

1) It's my turn in 3 GMR games. I download the save files.
2) While offline (perhaps commuting on the bus), I take my turns.
3) I connect to the internet again and upload the save files.