I really like the choice, but there are somethings it just won't do. Perhaps instead of using choice which doesn't show up in the gradebook, you might want to use the quiz which does. Just one question is all that you would have to have. It could be a true/false or multiple choice whatever. I believe all the answers can be set up to be full credit. You might also use the questions as feedback on the workshop if you wanted.
If you do something that needs the limiting of groups in the choice as listed in some of the postings above, have the choice and then have a link to the quiz when they are done. An online text assignment is also a possibility, but would need "teacher" to grade it.