And yes, I mean "moot", not "mute" although...never mind.
It seems like there are times when a question no longer requires an answer, but has not been formally answered and thus marked as such. For potential answerers to be apprised there services are no longer needed, why isn't there a "This question is now moot" element that could be clicked/pressed?
As an example, this question of mine:
I no longer need an answer, as I've solved it myself, but not really in a way that I would want to mark the solution as an answer to the stated problem. At the same time, I don't think the question needs to be deleted; I would just like to mark it as solved, so that nobody has to read through the voluminous first part only to see that it is no longer an issue.