I've only just seen this discussion. I would be happy to consider incorporating CBM variants or options into the Moodle code Tim Hunt and I developed for Moodle if there seemed good reason, but it would not be a trivial task. I would not go along with cutting out negative marks, because the whole point is that student marks should motivate them to be honest in reporting their confidence in an answer. Without negative marking, they would maximise their total scores by always expressing maximum confidence, right or wrong. If you want to use conventional scores for assessment (ignoring expressed confidence) then this is available as '% correct'. I don't much like the French scheme either, especially for self-tests, because though it is properly motivating like CBM, it seems too complex, especially for immediate feedback. Giving positive marks for wrong answers seems confusing. I would be pleased to discuss these issues. See: tmedwin.net/cbm , and do contact me at a.gardner-medwin@ucl.ac.uk .
