Who's Online Bot
 

I would like, if possible, to be able to assign a bot to Who's Online. In other words an admin that is on 24 hours a day so that the boards look that little bit less quiet when there is no-one around.

Is it possible to create a user that is just there to be on the "Who's Online" bit? :ermm:

Also, would it be possible to highlight in say, red, the users that are busy? Basically you would click a button to say that you are on the board but you are busy basically indicating that you don't want to be PM'ed.

First part:
Why not go to "forumhome_loggedinusers" Template and add the user before $activeusers.
So it would look like this:

<a href="member.php?s=$session[sessionhash]&action=getinfo&userid=XX"><b>YYYYYYY</b></a>, $activeusers

Its the fastest way to do this. Not the best, as there would be a " , " after the user also if there isn't a second user only.

the_sisko is right, that's the best thing to do. If you want to avoid the comma issue replace in index.php this:
with this:
(this is only part of a line)
And remove the comma from the template.

Do the same in the whosonline template, just add the code from whosonlinebit with the right info.