mod_rewrite add REQUEST_URI to URL-parameter, handle it with ColdFusion - apache

Question

I have a strange problem with mod_rewrite in combination with ColdFusion:
I'm using the following rewrite rules in my virtualhost-configuration:
RewriteEngine On
RewriteRule ^$ index.cfm [L]
# Add trailing slash if missing
RewriteCond %{DOCUMENT_ROOT}%{REQUEST_FILENAME} !-f
RewriteCond %{DOCUMENT_ROOT}%{REQUEST_FILENAME} !-d
RewriteCond %{REQUEST_URI} !(?i)^[\\/]CFFileServlet
RewriteCond %{REQUEST_URI} !index.cfm
RewriteCond %{REQUEST_URI} !(.*)/$
RewriteRule ^(.*)$ $1/ [L,R=301]
# Clean up multiple slashes in URL
RewriteCond %{HTTP_HOST} !=""
RewriteCond %{THE_REQUEST} ^[A-Z]+\s//+(.*)\sHTTP/[0-9.]+$ [OR]
RewriteCond %{THE_REQUEST} ^[A-Z]+\s(.*/)/+\sHTTP/[0-9.]+$
RewriteRule .* http://%{HTTP_HOST}/%1 [R=301,L]
# Pass all non physically existing files/folders to index.cfm in URL.original_url
RewriteCond %{DOCUMENT_ROOT}%{REQUEST_FILENAME} !-f
RewriteCond %{DOCUMENT_ROOT}%{REQUEST_FILENAME} !-d
RewriteCond %{REQUEST_URI} !^/cms/
RewriteRule ^(.*)$ /index.cfm?original_url=$1 [QSA,PT,L]
Everything is working fine except for one thing:
If I call http://www.example.com/test/?asdf my URL.original_url reads like this original_url=/test/index.php&asdf and I can't figure out why there is index.php in it.
I tried already leaving out the PT-flag but it doesn't work without it. All pages e.g. http://www.example.com/test/ return 403 - Forbidden and in title of the page says "JRun Servlet Error".
Thanks for any ideas on this one!
EDIT:
Ok, I missed something important: the folder /test/ actually exists in my documentroot! Other URLs like /test/does_not_exist/ are not affected by the described problem.
Summed up:
http://www.example.com/test/ -> URL.original_url gets /test/index.php
http://www.example.com/test/does_not_exist/ -> URL.original_url gets /test/does_not_exist/ which is my expected behaviour.