The PAP is used for laying out the ball - unless you are standing there with the pencil doing the layout, you don't need to know it. That said, I would be most higher level bowlers know their PAP.
I think that a lot of drillers, especially if they don't know you well, will assume that you are like most people, and know little to nothing about equipment. Over half of the people in my last league would sand their ball to get more hook, over and over, even though their ball was overhooking, leaving splits and rolling out. I went to the Pro Shop
in the center to have my Big One polished. "Wait, polish?" Yeah, I would like it polished. "Are you sure?" Yes, take it to 1500 and polish, I want more length! "Ok..." He still didn't seem to want to do it.
I now have a good relationship with a different Pro Shop
. He knows that I know a little, and most importantly, I know what I want. While he probably wouldn't let just anyone do it, on my last 2 balls, he let me lay them out, gave me feedback on making sure it was drillable (not drilling through half the pin, keeping the static weights legal), and punched it up for me. Would that happen if someone he didn't know had walked in? Probably not. I think that the importance of building a relationship with your pro-shop cannot be under-estimated.