Dick, I know bugger all about TAAATS and not too much on how ATC operates at Cairns ... however, from an idiot's of view ... if MSAW was operating at Cairns, we would be talking about an Approach scenario with about 10 aircraft all descending into the one aerodrome, on a small scale screen...
I would think that would be quite a different scenaio than an Enroute Sector with many more aircraft descending into many different aerodromes in many different weather patterns ..with many different trafic conflicts going on ... on a large scale screen