Guess the question's in the title. It would be usefulif you're wondering if the person you were discussing something with is still online. Note: I meant bar not button
We have that, but only for admins It takes too much db resources to implement it that it would affect on the usability of forums during the peak times to show everybody's status on forum posts.
What about giving that bar ability to senoir members? That way there wouldn't be too much of a drain on the db.