Actually that was my first core hack, to hide the "edit by" notice. Because it makes no sense if you cannot see what has been edited. So it is kind of "somebody changed something" "but you will never know what!"...
I know that Scott's great edit history plugin can help here, but nevertheless, please make the silence option for "all users".
Furthermore, I think there is a bug: When I visit my page anonymous, I still can see who edited (site in dev, nothing work): http://www.klaustukai.lt/2/starting-a-wonderful-forum-that-will-help-all-lithuanians Bug report opened here.
