A post of mine was recently locked, and one of the possible reasons for this is, according to one commenter, was the large number of revisions, which caused the post to be bumped each time.
In view of this, I propose to add to the "Edit post" page a checkbox labeled something "this is a significant revision", so that only those edits in which this box is checked will cause the post to be bumped in the main list.
Furthermore, if this feature is implemented, I propose that all the current rules that are based on numbers of revisions be modified to refer instead to the number of such "significant revisions". Ditto for any other possibly disruptive effects of revisions (e.g. notifications?); they would henceforth be tied to "significant revisions" instead.
SE sites places very high standards on question posts, and therefore it seems to me that SE should encourage, not discourage, revisions. The purpose of the requested feature is to reduce the potential disruptiveness of frequent revisions.
1 This is unfortunate, because the vast majority of those revisions where minor incremental improvements, all made in a good-faith effort to make the intention of my question clearer, and more specifically, to prevent the one particular misunderstanding that the earlier versions of my post had led to. In fact, at least two commenters requested that I edit my original post. Ironically, it was precisely one of these two commenters who later voted to have the question closed on the grounds that I had made too many revisions!