Need ability to support document camera video at same time as regular teacher video. Audio feedback currently prohibits this (even if muted) type of setup. Similarly, ability for student to have a second device (again, with no feedback) to display them writing in real time, would be helpful. Related request (Emily L.) need to have additional devices join without video and audio - So I or my students could join with a second device to write on (but not have it show up with video and audio).