Apache mod_speling for case-insensitive directories only?

I'm trying to get an Apache web server to do case-insensitive URLs. I had the sys admin enable mod_speling, and I set CheckSpelling and CheckCaseOnly to on in my .htaccess file. Unfortunately, that only corrects for case in the directories, not with the filename itself. For example, this is the correct URL:

http://www.domain.com/findPartner/certifiedPartners.php

With the changes I've described above, this URL works:

http://www.domain.com/findpartner/certifiedPartners.php

but this one does not:

http://www.domain.com/findPartner/certifiedpartners.php

Is there something else I'm doing wrong? It seems that everyone thinks that mod_speling will do the whole job, but it's just not working for me.

Thanks!