I can't imagine Miller and Pettersson not playing on the first powerplay is because of their feud....I can't imagine Tochett ever countenancing it.
But I actually don't hate the idea, if both Pettersson and Miller are playing at top form. I think when you have Hughes playing as well as he is, and when you have him playing the full two minutes, you can have a deadly combo with Hughes and Pettersson and Hughes and Miller on both powerplays, and perhaps it would lead to an overall better powerplay.
Its definitely not conventional.