I foresee that Aussie L4D2 players will have to keep a low profile online. "You're an Aussie? Kick vote!" Assuming that is possible in L4D2 of course.

uh..
I think Aussies are just going to play on Aussie servers.

I would certainly recommend that. They won't be welcome anywhere else.

Neither will their ping.

Yet again, I apologise for letting my home state (SA) resident Mr Atkinson ruin everything by not giving us our R18 rating. It's not my fault of course, but I certainly did not vote for him in any way, and would like to see him removed with someone better asap.
I don't care much about L4D2, but its the lack of the rating itself that is the cause for strife.