As much as I would love to hear "Sorrow" myself, I dont think chanting will work at all. The band work out a set list before each performance which is programmed into the lighting and sound computers, the show is so reliant on the technical effects, that to chop and change the songs or even the order of those songs is not a simple matter of pushing a button. Chanting for a song may well work on smaller groups without all the paraphernalia, but it will not be as practical at a performance as complex as the Aussies show.
So as it has been suggested, try sending messages to the bands official website and see if that has the desired effect.