Board Game Arena

I suggest adding a game option available at table creation, to specify the two factions.
When both players have joined, each will randomly be assigned one of the factions.

It will be nice, for instance, if someone wants to play the symmetrical north vs. south matchup.
Doesn't seem like it should be hard to add to the existing options.

You could always discuss it with your opponent before the game begins and then choose manually North and South...

This is a good idea, especially for real-time games. These days, I pretty much only play turn-based, and it seems difficult to have that sort of chat with my opponents, especially since they may have already chosen factions before I know who they are.