Some interesting things here.
The article from The Age has a picture of an official holding up a copy of what appears to be the perpetrator's IDs. Sure you can't make any detail of them, and the idiot's name has already been released, but an unusual thing to happen anyway.
I guess there's not really a big deal in the pilot calling a hijack when it was later said that it was not a hijack. Even if later it was - from what I can get from the article - reflected that it was near unnecessary to call for a hijack. I suppose much better safe than sorry, irrespective of the consequences (for the airline and the airport).
Of course, it must be said, what an idiot. I would like to think he should spend some quality time (i.e. a lot) in prison, but I'm guessing he will be organised to leave the country within a short period of time. Especially if it wasn't a "true" hijack, they probably don't have too much to pin on him more than the next drunken idiot on any given flight (who also slips by with a slap on the wrist).