I would like to edit e.g. this, but it seems a bit impertinent when the asker is active, as well as general users with more reputation than me.
Would it be OK to request a "suggest edit" button for the site?
I rolled back the edit because it changed too much. Typically, big changes are discussed in the comments first and then made by the OP if he agrees. I therefore do not see the need for such a feature (though don't have any kind of authority on this).
Once you have earned 1000 reputation and the "suggest edit" feature turns into an instantaneous edit feature, you're expected to know what to edit or not to edit. There are always borderline cases of course and that's fine, that's what comments are for.