Hide some files

$config['ResourceType'][] = ...

$config['ResourceType'][] = Array(
      'name' => 'Images',
      'url' => $baseUrl . 'images',
      'directory' => $baseDir . 'images',
      'maxSize' => 1024,
      'allowedExtensions' => 'jpg,gif,jpeg,png',
      'deniedExtensions' => '');

$config['ResourceType'][] = Array(
      'name' => 'Files',            // Single quotes not allowed
      'url' => $baseUrl . 'files',
      'directory' => $baseDir . 'files',
      'maxSize' => 0,
      'allowedExtensions' => '',
      'deniedExtensions' => 'php,php3,php5,phtml,asp,aspx,ascx,jsp,cfm,cfc,pl,bat,exe,dll,reg,cgi,htaccess,asis,sh,shtml,shtm,phtm');

I also wouldn't call this "hiding"
We don't plan such functionality yet, but everything can change.
Just curious - would you be able to filter list of sent files if you were allowed to modify the list of sent files by creating your own filtering script (on the server side)?

I'm just wondering how we can make CKFinder extensible so that if anyone wanted to add new functionality, he could do it.
In your situation: there is a list of allowed/denied extensions, but you would like to have a list of denied files.
This is how it works now:
1. User clicks on a folder -> AJAX request is sent
2. Script reads config file and send response with filtered list of files

What I'm thinkig of is:
1. User clicks on a folder -> AJAX request is sent
2. Script reads config file and prepare response with filtered list of files
3. If user registered it's own function to filter results, it's being processed
4. response is sent back

So my question is: if it was possible to do it, would you write your own function to modify the behaviour of CKFinder?
I'm just interested in your opinion