This would need more players, maybe in EiR2 (if devs and more importantly Sega let that ever happen), but it's ofc allways good to have ideas which can lead to great things like this mod.
Anybody heard of WWII Online | Battleground Europe?
http://www.battlegroundeurope.net/It's old but still alive MMO ww2 fps game. It has still thousands of players, one server and map size is only the area of western Europe. This is the current situation in their campaign:
As far as I know players get up in ranks and can eventually be commander of the army. So ncos and officers decide over other players, what squads, platoons, companies, battalions, brigades, divisions (and so on) do, where they attack etc. Okay too much offtopic, but this could give some ideas even though it's fps game.
I've thought also that it would be cool if EiR warmap was a bit similiar to Total War campaign map. Like if there were cities/towns/villages in sectors which could be fought over concrete. There could be three or even more versions of one map, town x, town x outskirts north, town x outskirts south etc. Your location in warmap would affect in that wether you're already (ingame) defending the place, or coming as a reinforse in x minutes.