There is now also a pitboss mode btw, we may want to try that
Pitboss is, in the words of the patch notes, a mode "which allows players to connect, take their turn, disconnect, and come back later. Email notifications and steam notifications are built into the system." A more laid-back mode for people who don't want to sit and play a round for several hours straight, see.
Sounds a bit like the diplomacy browser game for those who are familiar with it. Basically you just set up a game and take turns whenever you have time.
Post your steamprofiles and I'll add everybody who is interested so we can get it set up.