New Features Desired

When I set up meetings, the participants often come in after the start of the meeting. This becomes problematic when the first person is delayed a long time, and I have to interrupt my  work to constantly check to see if the blue 'admit'  button is on. I'd really like a chime or some auditory device so that I don't have to constantly check to see if they have come into the session to be admitted. It should be a feature that can be turned off as well.