Usergroup for spiders
 

This is probably a stupid question because i believe this is impossible... but i'm going to ask anyways...
Is there a way i can create a usergroup for spiders?
The reason i want to do this is because i want admins/mods/spiders to have their own color in online members list... As far as i understand i can only have admin/mods etc have their own color. For reference -->http://www.worldslargestforum.com/forum/index.php
Or maybe there is another work around to get spiders to have their own color?