More like a groupchat. I've been thinking the same thing. Here are the commands I thought of:
/startgroupchat
/addchat [Member]
/removechat [Member]
/leavegroupchat
/endgroupchat
Still needs some logic errors to figure out, but I've been thinking of this for quite some time now.
I know my apprehensions might never be allayed. And so I close, realizing that perhaps the ending has not yet been written...