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This option should contain a comma separated list of options you can override. These options can then be changed specifically in various directories by adding them to a mc_access file. The default value of this option is "*" which tells TinyMCE to allow override of all options.
$mcFileManagerConfig['rename.allow_override'] = "exclude_directory_pattern";
<add key="rename.allow_override" value="exclude_directory_pattern" />
# Override something
rename.exclude_directory_pattern=/somedir/i
# Allow override
rename.allow_override=exclude_directory_pattern