I didn't bother but you could try searching through http://www.phpbbhacks.com/lastupdated/3
Where can I find a hack that makes my screen name appear idle even though I'm at the computer? I know they're out there somewhere, but I've been searching for a while now on various websites, and no luck.
I didn't bother but you could try searching through http://www.phpbbhacks.com/lastupdated/3
GAIM, supports this feature out-of-the box.
Middleman works, too.