Coops,
seeing as how no one has answered your question, you might base your remuneration on the award.
For a casual pilot, the hourly award rate is 1/800 of the fulltime annual rate.
To determine the annual rate, you need to consider whether ops are IFR/VFR, S/E or ME and what weight caregory.
Caution: pilots of some Torres Straits operators may find the following information disturbing and should skip the next paragraph.
Typically that would place the full time salary somewhere between $37K to $43K pa,
giving an hourly rate of between $46 to $54 per hour, with a percentage loading for CP, a percentage for C&T, IFR etc, etc.
You should be paid the casual hrly rate per hrs flown, or a minimum of 4hrs / day on a rostered flying day, regardless of hrs flown.
As you and your licence form part of the AOC's approval to operate, a nominal retainer should also be factored in as you a key person to the operation, flying or not.
Why anyone would be silly enough to be a CP given the track record of the Townsville office,
(and a few other area offices too)
is beyond me, unless you have a masochistic streak.
Maybe as sanity is restored to the Townsville office this career path may again be satisfying,
but is it worth the aggro? Really?
MF