Hi,
so why don't you use the editing capability to edit the URL generated by JoomSEF "
www.mysite.com/images/index.php " and rewrite it to whatever you want? E.g.:
www.mysite.com/images/
Just note you cannot have 2 different SEF URLs for 1 original (non-sef) URL. So you have to choose whether you want to use just /images or /images/index.php.
The way how the autogenerated URL will look like may be affected in JoomSEF settings. E.g. you can change the index.php to index.html or anything else (also you may leave it empty).
Best regards,
ARTIO Support Team