Just an opinion on the mic or no mic question. I know from experience that voicechat in a small group of maybe four-five people is not a problem at all, but once you get more people than that, the loudmouths will take over, and the more quiet people never get a word in. Maybe some function to automatically mute everyone once you reach a certain number of participants? From then on you will have to type everything. There is of course nothing stopping people from using type only if they so wish! If you allow a large group of people to have voicechat you need some sort of moderation and ques system so everyone can get their questions/comments in.