Shoutbox

I think it be best to ask for such a thing over at the Stuffplug forums, esp. since Plus! is no longer needed to use Stuffplug. In my opinion it's not a good idea to write scripts that depend on another add-on beeing installed to work.

An upcoming feature of Stuffplug is scripting, see Stuffplug - Introduction And Upcoming Features. So if not in the program itself it might be done in a script.