Nothing. And as far as I can tell the #2 settings don't work.
Also IMHO schemes are meaningless, only styles affect player overalls, and oddly, matching styles between your schemes and starters doesn't always produce the highest overall. I've had pocket passers whose overalls were highest if I set scheme style to field general for example.
Me, I draft best available for most positions then adjust scheme style to match. Certain positions like WR that can be tricky. For example I have two red zone threat starters with scheme style set to match to max them out but a speed guy in the slot. His overall is not optimal since he doesn't match but still solid.