I did work for an opera company, once, that at the end of the very last performance of the season always had was they called the crew bow. Most of the crew being reluctant to be in the spotlight, singers literally dragged us onstage, lined us up and made us bow. I think it was just a chance for them to man-handle the crew; the singers enjoyed it more than the crew.
But no, SM or other crew bows are not typical at all. Actually, at curtain call, I make it a point to give my actors a standing ovation every night, if my position can be seen from the stage. I'm sure it makes them feel good to see me standing behind my position and applauding for them, too.