In the realistic battle mode, there will be a few things disabled and you can get penalized for friendly fire. In this mode you will have to rely on your knowlege and binoculars to idenitify the enemy and all aids will be hidden. Shooting team members may affect the outcome of the battle, in a negative way.
Mmmh what you describe is lone wolf mode.
It already exists, can be played in customs.
I thought you meant a different, historical loadouts battle mode (example a tiger vs a few Shermans and whatnot)
Bringing back the memories of team killing artillery where you’d accidentally wipe your whole team in the closed beta 
… or the plane bombs… oof…
It wasn’t just in CBT I think, as I remember it happening.
I remember laughing at keofox who whipped more of his own team with arty than enemies eheh
Yeah i think it made it into the early game release too what a nightmare ahaha
If they ever want to introduce friendly fire in a official gamemode they need to fix bots first. One time I called arty strike on the first point of a invasion which ended up getting me kicked because dumb bots rushed the point while it was being shelled.
Me with my 2 1000s bombs lol