This raises the question of the definition of "casual"
From what I have read someone who works fixed hours each week and is expected to turn up every day, as a "temp" on say a three month contract does, cannot be classed as "casual".
This is how the WA Govt define "casual" employment
Again, from what I understand from my own reading people are either "casual", in which case non of NES paid leave provisions apply, or they are "employees", in which case all of the paid leave provisions do apply, unless they come under an award which allows paid leave to be "cashed out", (which presumably applies to either a recruitment company or an normal employer).
I suspect we will soon see the courts deem a "casual" employee (who isn't really casual) to be a permanent employee of the end user of their labour, even if they have been working
through a recruitment agency ...