you donn make enemy for yourself but u make enemy for other player,
other player make enemy for you that means .
yes i want the map editor more customizable and powerful able us to make units with exported models and meshes ,able us to create and control world map by triggers and condition events and even scripts that able players to create and imagine that will make the game never ever die like war-craft .
u may able to create co-op missions with war-craft tool and add its AI enemy and the real

challenge here is build creative map make a lot of players add this map to their favorite i hope u understand what i means besides playing with only hero is great idea make the game from normal RTS to adventure gamed