Not what I asked about, but thanks, I guess.
As it so happens I can answer my own question now since I rushed the show yesterday. In case anyone else is wondering, I got to the rush around 4:45 to see if there was anyone there, and to ask if they would be selling rush. There was nobody there yet, and the box office guy told me there WOULD be rush (not surprising since it hasn't been selling very well). I left and came back around 5:30, and there was still no one there. I sat on the bench across from the box office window. By 6pm, there were about 5 other people waiting for the rush, and we all got tickets without a problem. Seats were toward the back of the orchestra, on the house left side, though not the FAR side. Great view.