Actual enforcement of the "no chatting unless the Pomodoro is on" and/or muted microphones.

One suggestion here: have during-pomodoro chats be queued (and, ideally, the queue is visible and editable). I often came across something in my reading that I wanted to share during the break, but didn't want to have to store in a second location (like typing it somewhere else, or remembering it, or so on).