Hmm, I don't think checking the forums for mumble-hangouts attendees is working, seems I need to start working on an attendee plus captcha bot for mumble asap. (And help you with a linux setup for your wallet Fuz, have you checked my tutorial I wrote especially for you?)
One example is that I'm pretty sure I was there at the previous hangout, considering how my recording was used for the soundcloud upload.
So for the attendee-brownie-bot, what model should I go for? Ask a random question from a list of questions to each person present individually and compile a list of all correct answering attendees within a timelimit? Or one I kinda like more, let Fuz/Bytemaster ask to repeat some random fact mentioned during the hangout and let people send the answer through private-messaging to Fuz/brownie-bot and distribute the brownies only to people who gave the right answer. Maybe a combination of those 2, so you can rule out sock-puppet accounts plus only reward people who actually listened to or participated in the hangout.