Here's a interesting request, good for screenshots or making a simulation:
How about creating a custom game without any CPU's and all factions you are free to command? For example you have two opposing factions and you can command both of them to your own destruction (there can be differing halos instead of green, yellow, and red; halos should be based on the team number/color).
If this has been already been requested before, please send me the link.