Tim Miller just wants to teach. Well, that’s not entirely true. He wants to act and perform and raise Cain too. And tell stories and entertain and create that almost indefinable flash, that tantalizing moment when an audience says, “Yes, we get it!” So it all boils down to teaching. That’s why he was so deeply offended when Villanova University, which had invited him to conduct a weeklong workshop with enthusiastic theater students, a few weeks ago abruptly disinvited him and canceled his workshop.