An "all friends" chat

I would like there to be an "All friends" chat option. A way for me to just talk to all those on my friends list, in the same matter that you can talk with everyone in the LS.

I have good friends in several different LS', and neither them or I want to create ANOTHER LS just so that we can all talk to each other. We all have different reasons, though the popular two are not wanting to have to change LS back and forth, and the additional personnel control that you have over you friends list.