What are your objectives? I ask because your objectives will influence the answers. Are you trying to open your own roastery?
If you have solid fundamentals, you would probably get the best bang for your buck in improving your skills by doing some work at a cafe and focussing on speed. If you contact Veneziano in Brisbane, they might be happy to put you on the machine for a few hours.
If you want really serious, high level commercial roasting instruction, my understanding is that many pro roasters believe that it is necessary to book an international flight. Yeah, its a pile of $$$, but note that a lot of the best roasters in Australia have done it. Other than that, the most important things to do would be to roast, tweak and taste a lot of things head-to-head, as well as tasting offerings from other roasteries extensively.
Hope that helps,