Exactly like that! What you need to do is add a subchannel to your own. Right-click menu is your friend. Then, add a number of keybindings in settings. One for each of the different Barneys SL/BL subchannels. This becomes your "whisper list". Use the same key for all of those. Finally, thosw of us who are playing as leaders, will need to add your leader channel to our whisper list.
It's a one-time operation, then we're all set for the remainder of time.