Its good if they have something like that feature since its no sense at all if majority of them will unload immediately their bitcoin since it possibly could move the price of bitcoin plus provably these news will create a lot more panic since lots of people easily get carried out by the news they read online and some may think that this is risky situation that's why there might be a lot of people will join to dump their bitcoin.
We could able to see that bitcoin still recovering back and we can say that everything is fine even if there's a sort of repayment for their creditors happen. People are now open minded on the news and just think about everything is fine even if there's some developments happen on Mt.gox.
If they don't have those kinds of guidelines, there will be chaos and panic, and the implementor will be blamed for paying all their claimants in one go because this market is still safe and can easily rebound if even half of the claimants dump it.
But I'm sure all claimants are fully aware of the consequences of their action if all of them dump their shares, so they will opt to dump a portion or do it later; if I'm a claimant, I will sell 10% and just sell later, but I will retain a big portion for future profit.