Reply To: Give WordPress Tags to Ressources

add_action(‘init’, ‘er_add_default_boxes’);

function er_add_default_boxes() {
register_taxonomy_for_object_type(‘category’, ‘easy-rooms’);
register_taxonomy_for_object_type(‘post_tag’, ‘easy-rooms’);
}

In a new plugin, in /lib/function/both.php or maybe even your themes functions.php

If it has to be an own category system you’ll have to use http://codex.wordpress.org/Function_Reference/register_taxonomy and replace the ‘category’ above with your registred taxonomy.

As ther’re to many user that don’t need it at all I think it would be a waste of loading times to add it by default.