When you brought SRIV or was gifted one or had imported CD key to activate on Steam, did Steam change the ROW version into Aussie censored version or not? I haven't found any threads that verify this..
No idea. I don't know anyone who have imported it yet. Can't seem to find a concrete answer on the internet either. I'm guessing importing a disk will allow you to play international, but that's only if it's a disk install. If it goes through Steam, then it may still work but chances are it will verify after the install and update to Australian locale.