You could include my random thing anywhere you want. My isntructions call for it to be included in ubbt.inc.php before the header I think.... but you could include that script from anywhere....
Just use the script name in your include, and customize the hidden form to whatever you need.
the trick would be including the shoutbox I guess.
But it would be doable. I guess you'd need a bit of code in ubbt.inc.php to determine if it's going to display the the shoutbox... or once every 10 times or so, display a random banner in that space instead.
It could be done.