I have added the staff page mod to the forums using the default theme. I will try to get it on some other thmes send me button images!
You can access it via
http://yourfourmname.smfforfree.com/?action=staff

Some notes in order for members to see the staff page you need to set their permission to view the staff list.

If you want to filter a group from the staff page you wil need to goto edit features and options and Basic Forum Features and enter the group name it is case sensitive so type it exactly how it is.

Enjoy,

SMF For Free