mapping cant be 30/70 or 50/50.
electronic center diffs distribute the power/torque continiously depenting at which point of corner is the car
the 50/50 or 30/70 distribution is from gears,and not mapping
that can change only with different gears
Of course from mapping you can transform the behaviour of the car,but that is something different
probably the author something didnt understand or lost in translation