I usually edit questions that are not very well-formatted. In fact, before reading such a question, I instantly start to edit it. In other words, I read and edit the questions simultaneously. Recently, I even jumped to answer to a possibly too-broad question. As you can see on that question, one can suggest a dozen words.
However, then I decided to delete my answer and flag the question as "too-broad". I hesitated to do that because the border line between too-broad and not-too-broad is not very obvious to me.
That motivated me to ask a question here. I mean isn't it really awkward to flag a question that you edited yourself?!