Many edits seem to be about taking code snippets and properly formatting them, taking care of indentation, spacing etc. The tools of the trade are things like jsbeutifier, cleancss.com, etc.
Would be nice if the editor itself prompted to do this for me. e.g. when it notices a new js snippet it could open a preview pane where the code is properly formatted so the user can opt into the enhancement.
Could start this feature out small with just one particular language as a pilot and see how many people accept the suggested beautification. Alternatively this feature could start off as a moderator tool and if it proves itself it could be opened to the public.
{-on-its-own-line-or-not problem? ;-)