That sounds good Marc, but as long as it does not get too complicated to set-up, install, initiate and use. The easier the better, the more simple, the better. The best black-box approach would be to get one that will not break, i.e. not dependent upon too much in Moodle, no matter how much Moodle might change around it. But, GLWTOB!
Oh would you believe it, but I have been writing a paper on common features of Psychopathy and Narcissim... very interesting ..