Something

<VirtualHost 127.0.0.1:80>
        RewriteEngine On
        RewriteCond %{REQUEST_FILENAME} -d
        RewriteRule ^(.*[^/]) $1/ [R,L]
        <LocationMatch .*[^/]>
                Order allow,deny
                Allow from all
                SetHandler perl-script
                PerlHandler Foo
        </Location>
 
       <Directory /home/blah/promos>
                Order allow,deny
                Allow from all
                Options +Indexes
        </Directory>
 
</VirtualHost>