If they wanted it, they would ask for it. If it was a useful optional item, everybody else would be doing it. You're asking for questions and not listening to the answers.

As far as how they decide who gets called over others, anybody who is not on the hiring board is just taking an educated guess. My personal opinion is that there is some sort of algorithm that scores your accomplishments and elevates certain profiles so that the actual resume is read by a human. There's no telling how much weight is given to something like Instructor Hours versus attending WIA, but I'd wager money that the font and cover letter on your resume don't mean jack.