"Maintenance releases, in australia they must be signed every day before the first flight. (Or if signed by a PPL then before each flight)"
I think you should revise that one. You are signing to say that you have performed a daily inspection. Pilot licenced to fly the aircraft can carry out this maintenance IAW CAR 42ZC PPL or CPL no difference.
I stand corrected, from what I could find out, it doesn't matter if you have a PPL or CPL, just so long as you have a full licence. Another difference between australia and NZ, you can make head and tail of the rules in NZ...
