I have created a custom taxonomy and I want to make each one user specific (the user can only see and use the tags they created when using MB Frontend Submission). To do this I changed some code in taxonomy.php to set the slug of the term to have the User Id at the end. Currently, the term was being saved with 'wp_insert_term()' in 'protected static function add_term($field)' but the $args were not passed.
I don't like this solution because the changes I made will be lost when I update MetaBox. Is there documentation for creating my own MetaBox extension plugin?