1. Civil ATCs cannot retain rating endorsements in a weekend only tower. Anyway Tower services (RWY and TWY control) are probably not required. The US would provide a Class E terminal airspace service to the ground assuming the ILS was operational (Has it got an ILS?). If Williamtown is that busy a smart country would make it a civil airport with a small military component, the US do it all over the place with ANG units. IN Pommyland the military airspace is 5nm around the field with a short pan handle along the most used instrument approach. Easy to avoid if your VFR but a call to the Approach unit and they will keep you clear of their spam cans.
2. Ergo there is no reason in the world of real air traffic control to not allow a VFR transit of the CTR either by design or using procedures. (Its particularly easy if you have radar!) However in Oz woe betide a blue suiter letting a VFR lightie get in the way of the Sqn Ldr and his jet propelled spam can.
3. If you read many of the other posts on Pprune, Oz had the "best ATC system in the world" until someone came along and rattled the cage of complacency. Why doesn't anybody else complain? Is it because they have never seen good ATC systems operating or is it because they have to live in a world where they have to make a living? That is, make friends and influence people.
Keep up the good work Dick!