If you fullscreen the Remarkup input in Conpherence, it's not obvious that send-on-enter is sending thousands of copies of your message in the background. We could perhaps:

1. prevent enter from sending in fullscreen mode (best?);
2. make enter kick you out of fullscreen mode (worst?);
3. prevent users from entering fullscreen mode in the first place if enter is in live-fire mode (okay, maybe easier than (1)?).