We have differences of opinion on what a good question is here. But generally we can find a common ground and constructive version for most questions worth saving. But editing them on the site is counter productive and sometimes creates conflict. Instead I propose if someone other than the OP wants to save a question that we discuss changes to the question on meta before actually making the edits.
This policy would not be need to be followed for correcting grammar or clarifying from op comments. But just for questions that have been closed (are about to be closed) and a third party wants to save them. I do not think it needs to be an official policy so much as a standing guideline that we follow.