I have sent GM's a PM prior to the quest ( read as a day or two beforehand .. NOT 10 minutes before ) asking which of my characters would best fit the quest... This allows them to offer a suggestion, based on the goal of the quest, without revealing any further information.
However, as far as causing chaos- I don't think there should be any ooc grievances for someone playing true to their character, whatever the cause. That's why it's roleplay. We go by what our characters would do, not necessarily based on a preset storyline. If that was the case, what would be the point of going? It only has one ending. We want to be able to affect change in the world. We want to matter, to make a difference. And... sticking with the original point- each character has a different way of feeling that they have made a difference or reached a goal.
My only request is that closed party quest series be limited to something reasonable, like a maximum of 5 or so closed party sessions in a row. When I check the calendar and see "session 8, sorry this party is closed. Only people who have been on the previous 7 episodes are allowed to participate" it's kind of frustrating.