interesting read. I agree with the authors numbers. They spear to be real.
I will say if we had a cable like an older carburated car I would have changed the springs and length of cam arms and kickdown ratio to give the pedal the feel I wanted.
For what it's worth the sprint booster gives me similar results on the drive by wire.
I'm sure I could cut and modify stuff to achieve similar results but $250 is worth it to me to not ruin my parts.