I had a thought. Could challenges for editing words/time/pages be added. I see this as something different than revision, which is why I suggest it. In my mind, editing just covers things like misspellings/typos and odd continuity errors and such, and revision is for something closer to a complete overhaul of a story, where whole sections need to be rewritten.
I ask for an edit words/time/pages because I generally don’t do revisions.