As I keep saying, they can simply NOT increase/scale/tweak anything.
Just a toggle to increase party size with the following note next to it: Combat encounters are scaled and balanced for a party of four. In choosing to increase your party size, you should understand that encounters may become considerably easier.
That's it.
Yes, but that is like repairing a road full of potholes by putting out a roadside sign saying 30km/h (where you normally would drive 90km/h)
