Choosing taxonomies to search

Settings > GeoDirectory > Custom Post Types shows that gd_place will search the taxonomies: gd_placecategory and gd_place_tags. Is there a way to append other taxonomies to this value other than directly altering the record in wp_options? (Would that work if I did?)

I am trying to add new taxonomies to posts, but want to make sure they’re included in the search logic. From what I’ve traced through the code, this is the way to do it, but it seems like there should be a way to do this from the UI.

For reference, I was led here by looking at:
geodir_advance_search_filters/geodirectory_advance_search_function.php:2114

$post_types = geodir_get_posttypes('array');

    $post_type_tax = array();
    $words = array();

    $gd_post_type = isset($_REQUEST['post_type']) ? esc_attr($_REQUEST['post_type']) : 'gd_place';

    if (!empty($post_types) && is_array($post_types) && array_key_exists($gd_post_type, $post_types)) {
        if (!empty($post_types[$gd_post_type]) && is_array($post_types[$gd_post_type]) && array_key_exists('taxonomies', $post_types[$gd_post_type])) {
            foreach ($post_types[$gd_post_type]['taxonomies'] as $geodir_taxonomy) {
                $post_type_tax[] = $geodir_taxonomy;
            }
        }
    }

I haven’t checked to see if this looks like a promising path for searches other than autocomplete, but I was hoping…