Sorry, I don't know any other way to describe it. At my place, different sub-forums use different styles. I thought that was pretty common in vb world. I didn't want to use my forum's default style for the game roster.
e.g. the default,
http://bressler.org/forum/index.php
e.g. a subforum,
http://bressler.org/forum/forumdisplay.php?f=10
e.g. gaming forum,
http://bressler.org/forum/forumdisplay.php?f=8
If there's not a way to set it dynamically, I can just strip out and replace $header in the SHOWROSTER template. Fortunately, so far, the difference is limited to mostly the banner. Just means I'll have to change that template by hand every time I change styles.