I was wondering if you were doing some kind of a workshop. My first thought when new to Moodle was to use Workshop, but then I realized it wasn't being maintained.
"This module maybe removed from the standard Moodle in 2.0" turned me off. http://docs.moodle.org/en/Workshop
If you stick with the forum, you can just have students submit a revision as an attachment. One virtue of having a revision go up that other students can see is you won't be the only one saying, "You didn't change much, did you?"
Assignment
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