The ability to send text messages to the headsets would be very nice. We do a lot of parties in which the group wants to take a break in the middle of their 2-hour party for food, cake, opening gifts, etc... So being able to send that out to all the stations, "Pizza in 5 minutes" or something like that would be handy. If we could send it out to multiple stations at a time, this could also be used to give instructions to people trying to get into a multiplayer match and the steps for that are not so simple, and they're in a different room.
There's already those notifications that pop up when we extend their booking, so just use that same system and let us type custom messages.