If you want to add css to the [support] on BP 1.6.x group forums it's impossible to do correctly due to a permalink title in BP's forum-loop
The css tip given by imath in the plugin readme concern only the SW forum using the complete bbPress plugin.
This is now fixed in the trunk and can be used on stable BP 1.6.x
Ticket here: http://buddypress.trac.wordpress.org/ticket/4770
I explained the usability here: