As far as the Audience Response System (hand-held voting system), we have been using them very successfully for classroom training for about 6 years now (annual battery replacements). Its just that the programs we have been preparing and delivering are moving out of the classroom, so we have turned to Moodle.
What you propose, using a real time quiz via Moodle, may add a very interesting wrinkle to what we are already doing. Definitely will look into it.
Thanks for the heads up on it.