I think by default, the "Edited by:" only shows if the "Reason why edited:" is filled out in the posting page.
I'm guessing that hack above will add "Edited by:" to any post edited without the "Reason why:" filled in.
And it will probably work for new posts edited, not the old ones already listed as "Edited"
Is that what you want? For it to list "Edited by:" without the "Reason why:" filled in? I wouldn't want that myself.
You know you can modify the layout of the default "Edited by:" to look like you want.
And you can make a bbCode to match that. Do you have an image of what you want it to look like?
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