Is there a way to edit the blockchain randomly? What if it had a feature like random deletion/addition of coins? Wallets can be picked randomly and maybe do up to 5% change to it. It would be hilarious users getting pissed about coins missing and others bragging that they took them. I also like the fake transactions that disappear idea.
Just use the mtgox wallet that should work fine
Gox trolling was pretty amazing. "We're going to open up withdrawals on Monday".... suckers!
Woohoo~! 
FYI, may be pushing up the release as stuff has come together a little more quickly than we had planned. 