Leave it empty to disable its application.
As i tried to explain:
This suffix is being applied to the code to change css selectors.
Since my previous post has been a little stripped, i try to explain more clearly.
On many positions the output refers to a class "fb_blocktable".
When setting the suffix to "expert", the resulting class is "fb_blocktableexpert".
When you use this selector in the default installation, nothing will happen - except all selectors related to "fb_blocktable" and its defined look will disappear...
You need to define your own design / special looks using this selector.
This is the same way as one does it with css suffixes for menus in Joomla designs.
If you're looking for a forum using this feature, watch
www.seniorweb.ch/index.php?option=com_fireboard&Itemid=470
The most bottom "Experten-Foren" category uses this feature to show up with different color. Also inside forums:
www.seniorweb.ch/index.php?option=com_fi...showcat&catid=15
Attached the additional lines within our css to get the red "expert" look applied to the selected forums. You need to extend the CSS to get a useful application of that feature!
Hope this unveiling helps your imagination.