Shoutbox

As far as I am concerned, there is no possible way to add options/features to the actual Messenger client. In this case, the statuses and their functions. (CookieRevised could help elabourate further on this subject...)
As to the rest of the whole arguement. Give up. There is no work-around for it except for Plus!'s custom statuses. We cannot do a "script" or an "add-on" or an application that would add these options back. However, what can be done is for Plus! to add the missing statuses (as personalised statuses, of course...) to the status-list by default. However, I doubt that this would happen now. It might happen at a later time, though. If Patchou finds it useful, of course.