**Editor**

Those that may not have many questions or many answers or comment a lot or vote a lot or review a lot or flag a lot but have sufficient rep (I think 2k is the bar), can still improve existing questions and answers by editing. I believe there are people like this or people who just like to improve existing content by editing it.

They would:
- choose specific, suitable question titles
- remove unnecessary parts (salutations, roundabout formulations)
- correct spelling or grammar mistakes
- improve formatting of text, tables, graphics
- streamline examples
- add-in feedback from comments
- check appropriate keyword usage

and thereby improve content, preferably of highly important (scored or visited) content. I would dare to say that the editing role is sufficiently different from the asker or answerer role with unique requirements. And the editing activity is surely having a very important impact on the success of the site, improving the quality of the content.