Well, if CASA don't specify a pitch limit it's a mistake in my view - you can do a loop with wings level!
Ag work, mustering etc need some leeway, in that 'judicious manoeuvering appropriate to the task' (my attempt at lawyer-speak) is needed to do the job, and can be done safely, but a 60 bank / 45 pitch sounds more than reasonable to me as a limit for normal ops for legislative purposes.