We've recently added Conversation Mode as a feature of Rehearsal Live Share. You'll need to be on version r27913 or later to take advantage of it. Here's how to update.

In the initial version of Rehearsal Live Share, only the director could see and hear the group of participants. Now, with Conversation Mode, everyone can hear each other right up to the time that the director hits the Play button and the music starts. During conversation mode, participants will be able to see each other as well. Whomever in the cast is loudest during the conversation will have their feed superimposed on top of the director's window.

Once Play is initiated, the director will once again be the only one who sees/hears the participants as RLS works its magic.