I think having to anticpate in real-time when a particular character has the next line is a bit tricky. Even in the tutorial Barry has a buffer to help out.
Perhaps we could allow the Shush/Talk buttons to be effective when the recorder is paused. This way you can pause at the end of a line, shush the current actor, talk the next actor etc.
Maybe (later) a dialoue editor with a track for each actor so you can easily see who is speaking when.