Sometimes, I ask a question, and a few minutes later realize my question is ambiguous and/or unclear and/or would benefit from a major rewrite. At this point, I kind of "panic" and frantically try rewrite the question, often introducing mistakes in the process.
To prevent this sort of thing, it would be useful if questions were "pause-able", making them no longer appear on the main list, and preventing new answers, so that the asker can do these kinds of major rewrites.