Custom Battle faction vs itself

[DesMarekle]

When you play a custom battle and you choose (for example):

player A: England
player B: England

and you want to start the battle, it says: "armies of the same faction must be in the same team"

any ideas on how to allow a faction to fight itself (civil war)? Adding the rebels as playable in custom battles does not work for the mod i'm using...

[Swagger]

you'll have to make a copy of the faction itself

sucks though