Support » Requests and Feedback » Request meta_form meta_key hook
4 years, 10 months ago
The meta_form() function should have a hook after setting $keys to be able to modify the array of meta_keys before the HTML <options> are created. Something similar to:
$keys = apply_filters( 'postmeta_form_meta_keys', $keys );
The only option now is to modify the query using the query filter.