It wouldn’t change much, but a defender clearing the puck over the glass should be treated the same as icing. If the team clears the puck over the glass before exiting their zone after the subsequent face off then call a Delay of Game.
I can’t stand the Delay of Game rule for accidental pucks over the glass, though. It doesn’t feel in the spirit of what Delay of Game means to me, at least not anymore than intentionally icing the puck.