MCFileManager if created to be easy to integrate with existing server applications such as CMS systems, web hosting controllers or LMS systems.
I can't override option XYZ in a specific directory / mc_access not working.
Check the .allow_override option in you config.php file and also that it's not restricted by some other mc_access file. Remember the config options inherits.
Variable substitution in options is not working.
If you specify for example ${rootpath} remember to place the contents of this option within ' characters instead of " characters.
This will not work: $mcFileManagerConfig['filesystem.file_templates'] = "${rootpath}/templates/document.htm"
This will work: $mcFileManagerConfig['filesystem.file_templates'] = '${rootpath}/templates/document.htm'