I know this thread is called ask the Edain Team, but I'm pretty sure I know the answer to this.
There can only be a certain amount of Game Modes due to the engine of this game, which is why when Elite Mode was added, Battle Mode was taken out. Though as the Team said in the patch notes, Battle Mode was a bit redundant since Epic Battle Mode also raises Command Points.
So to add a Game Mode that only allows 1000 Command Points, it must replace one of the already existing Game Modes.
At least, that's what I think. The team can correct me if I'm wrong.