mod_rewrite and mod_speling not working together

I have a site where mod_rewrite is needed for a custom php framework.   The site in question is being transfered from a windows server using ASP to a linux server and will be converted to php.  On the windows server the files could called with case insensitivity.  I'm trying to duplicate this because a lot of links on the site don't match to the exact case of some of the folders or filenames.  (we didn't build the site, we're just tranfering it, and I don't know why the original developer did that.)

I enabled mod_speling but if mod_rewrite is on with our rules, it doesn't work.  If I take out our mod_rewrite rules, then mod_speling works as it's supposed to.  I understand why this happens.  Our rewrite rules have conditions that state that if the REQUEST_FILENAME is not a file or directory then execute the rule.  

I don't know if it's possible, but can mod_speling and mod_rewrite play nice and work together?

Here's the information in our .htaccess file for mod_speling and mod_rewrite.

<IfModule mod_speling.c>
    CheckSpelling On
</IfModule>

<IfModule mod_rewrite.c>
    RewriteEngine On
         
    RewriteCond %{REQUEST_FILENAME} !-d
    RewriteCond %{REQUEST_FILENAME} !-f    
    RewriteRule ^(control)$ admin.php?use=yes [L,NC]
   
    RewriteCond %{REQUEST_FILENAME} !-d
    RewriteCond %{REQUEST_FILENAME} !-f    
    RewriteRule ^(control/)(.*)$ admin.php?use=yes&url=$2 [L]
   
    RewriteCond %{REQUEST_FILENAME} !-d
    RewriteCond %{REQUEST_FILENAME} !-f
    RewriteRule ^(.*)$ frontend.php?use=yes&url=$1 [L]    
</IfModule>

Thank you.