in reply to Turning off Mason for a subdirectory
I haven't tested yet, but this is the general idea:
In the directory you want left alone, create an autohandler:
<%flags> inherit => undef </%flags> <% $m->call_next %> [download]
Alternatively, you can create an .htaccess file in the desired directory (or <Directory> block in httpd.conf) that has a RemoveHandler directive.