I have attached a file containing the patch. The file also explains how to apply it. There's just one file, and it should be easy.
I strongly suggest that you prototype your workshop activity before trying to use it with your students. Do this by creating a couple of test students and run through all the steps that you plan to do in class with real students. Make sure everything works the way you expect!
If you have trouble understanding the grading page (you will, you will), take a look at this discussion, where I explain how to read it.
If you need help, you can post back to this discussion or start a new one.
Custom Scales in Workshop Module in Moodle 1.8.2?
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