on *:join:#channel:{ cnick $nick 6 }
This sets each nick that joins purple. You could use it with:
on *:part:#channel:{ cnick -r $nick }
Or just if you're away:
on *:join:#channel:{
if ($away == $true) {
cnick $nick 6
}
}
..and so forth. See /help /cnick.
Hope this helps!
Regards,