Ahhhhh you are of course right. I checked on a non homepage instance and it works fine. The htaccess is set to remove index.php
#RewriteCond %{THE_REQUEST} ^GET.*index\.php [NC]
#RewriteCond %{REQUEST_URI} !/system/.* [NC]
#RewriteCond %{REQUEST_URI} !/kcfinder/.* [NC]
#RewriteRule (.*?)index\.php/*(.*) /$1$2 [R=301,NE,L]
How would I modify it to allow for the for submission?