tbh, who cares if they bowl trash now? I know that sounds like the wrong attitude but they're not going to get Clarke, North, haddin and Johnson out for 50 runs, australia will probably declare at 500 anyway.
as well just giving them the runs, instead of tiring themselves out bowling themselves into the ground.
if pakistan are to have a half chance they're as well batting as soon as possible to give themselves any hope of putting on the 700-800 needed to setup a good final day. Which they won't do anyway.
OH well that was a well timed press of the submit button, they've declared already.