What do you thing about unlock units or change look of them, for example: you want to make a undead knights faction. Only knights in El are BL but their are gold, so dark atmoshere go out. As undead faction you need a zombie unit. Who craft zombie? Necrophages proliferator. So these two things make imposible to make your faction live. I thing that more flexible system of creating factions can make this game more intresting and  give players more hours of fun