The plugin has hidden area: wp-admin/edit.php?post_type=meta_data_filter&page=mdf_utilities
To display it:
- open index.php of the plugin (near row #33)
- find:1//require plugin_dir_path(__FILE__) . 'ext/utilities.php';
and uncomment it (remove '//' on the beginning of the string)
- save the file
- you will find useful utility there 'Terms to meta' which allows convert any taxonomy terms slugs or names into meta data
p.s. this feature is not supported, its works as is.