AD1080, as far as I know, moseley threw before breck in practice, but the morning of the world cup at breck, he threw it and it went well, so Cooper, his coach, told him to throw it. I believe there was some discussion with the judges and moseley took an extra demonstration run down the bottom section to show them what the heli mute is supposed to look like, and it was on from there. He could not have won if they didn't know what they were scoring.
and Switchstyle, inverts are allowed in bumps. They were not allowed until 2003. I agree it's lame that some things were not allowed, but now all tricks are allowed from D10 to triple twister, to double-full. ideally, you could show up and throw whatever you want and they would judge it, but the judges need to have things brought to their attention and learn to score them so that they can score consistently and theoretically the best runs will win. The judges just aren't on the scene enough to know what they're looking at without clinics and video reviews.