Well, not actually a public forum, but the Helicopter Association of Australia (HAA) tries its best to fight overly-rigid legislation. Unfortunately it is run by unpaid volunteers, who usually have their own jobs to perform and cannot devote the time needed to hit CASA as hard as is needed.
Those HAA execs work their backsides off but are limited by a couple of factors: membership money, and the lack of people willing to put up their hands to have a go.
If you are keen enough, go to the HAA website, get some contact info, and get in touch with your nearest member. It is our best chance of getting something done.