If you would enable that, we would have a shorter shoutbox and kinda less letters viewing and it could be uncofortable for some of people here, by me is not anything wrong how is it now and if more ppl would like to see all visible online users, just do it, i'm kinda 50%-50%, but if you want to add something extra you could create an option like a area in shotbux where you could have Online users, Offline users.
And the option will be "Expand" or "Minimize".
In that way, the ppl who want's to see all online or offline users could click on expand and the ppl who want's to not see online or offline users, can click on minimize.
That's my opinion/idea.