I've already made a 2 vs. 1 map. Two players on a team cannot access iron so they must use primitive units. They also have a difficult position to defend.
I've also made a balanced (almost perfectly, down to how many tiles of gold each player, trees, elevation, etc) 1 vs. 1 since I noticed the Remake currently lacks these.
Hmm. Your idea sounds most interesting, Dark Lord, but as you said, it would be best with fog of war. If we could somehow use triggers to reward a player for not camping, then it would work even more. But for now, I'd like to focus on what can be done right now.
Battle missions are not hard to make. I can get an eight player one done in a day if I have time. I'll get right on that.
I'm a big fan of non-symmetrical maps.
So am I (sometimes, anyway), but from what I gather from making them, it seems that a peace time is almost completely necessary since 3 players with militia will rush more than 2 players every time. A way to balance this may be to give the big team less resources (mostly timber) then the little team.