RAA planes are, if suitably equipped, able to request and be given clearance to fly into and through controlled airspace. The PIC must have a CTA end. This means that the PIC needs 3 qualifying bits of paper. An RAA Cert for the plane in question, a CASA License AND a CASA CTA Endo. This is the current law.
I am not sure where some of those on these forums get off claiming that 1. You can't currently fly RAA through CTA, 2. The world as we know it will somehow vanish if RAA Certificate holders are given the opportunity to qualify for a CTA Endorsement without the need to hold CASA Licence.