我为你的第一个问题想出了一个解决方案。i、 e税务元框，仅建议现有条款列表中的条款，但不允许添加新条款。该解决方案基于jQuery，并修改标记（即非继承人分类法）元框的默认行为。

Limitation: 目前，它只允许一次添加一个术语，即不能将多个现有术语添加为逗号分隔的值。

代码也可以作为github的gist.

我可能会在下周末为分类法做菜单编辑器，比如metabox

下面的解决方案可以用作插件，也可以用于您的函数。php文件。

<?php
/*
Plugin Name: No new terms taxonomy meta box
Plugin URI: https://gist.github.com/1074801
Description: Modifies the behavior of the taxonomy box, forbids user from selecting terms that don\'t belong to taxonomy.
Author: Hameedullah Khan
Author URI: http://hameedullah.com
Version: 0.1
License: Do what ever you like, but don\'t publish it under your name without improving it.
 */

/*
 * For more information: http://wordpress.stackexchange.com/questions/20921/
 */

// currently works only with single taxonomy which should be defined here
// default is the built-in post_tag
define(\'CTM_TAXONOMY_NAME\', \'post_tag\');

function ctm_custom_tax_js() {

    // taxonomy name not defined or set to empty value
    if ( !defined(\'CTM_TAXONOMY_NAME\') || !CTM_TAXONOMY_NAME ) {
        return;
    }
?>
<script type="text/javascript">


    function ctm_custom_termadd_handler(event){
            var tax = \'<?php echo CTM_TAXONOMY_NAME; ?>\';
            var input = jQuery(\'#tagsdiv-<?php echo CTM_TAXONOMY_NAME; ?> input.newtag\');

            var q = input.val().split(\',\');

            // if there are more then two values, just add the first one
            // NOTE: because this solution does not support inserting multiple terms
            if (q.length > 1) {
                q = jQuery.trim(q[0]);

                // as we don\'t support multiple terms
                // set the value of input box to the first term
                input.val(q);
            }

            jQuery.get( ajaxurl + \'?action=ajax-tag-search&tax=\' + tax + \'&q=\' + q, function(results) {
                var tokens = results.split(\'\\n\');
                for (var i=0; i < tokens.length; i++) {
                    token = jQuery.trim(tokens[i]);
                    if ( token && token == q ) {
                        (function($){
                            tagBox.flushTags( $(\'#tagsdiv-<?php echo CTM_TAXONOMY_NAME; ?>\') );
                        })(jQuery);

                        return true;
                    }
                }

            } );
            event.stopImmediatePropagation();
            return false;
    }

    function ctm_custom_key_handler(event) {
        if (13 == event.which) {
            ctm_custom_termadd_handler(event);
            return false;
        }
        return true;
    }

    jQuery(document).ready(function() {
        // unbiind the click event from the taxonomy box
        jQuery(\'#tagsdiv-<?php echo CTM_TAXONOMY_NAME; ?> input.tagadd\').unbind(\'click\');
        jQuery(\'#tagsdiv-<?php echo CTM_TAXONOMY_NAME; ?> input.newtag\').unbind(\'keyup\');

        // hide the howto text for inserting multiple terms
        // NOTE: because this solution does not support inserting multiple terms
        jQuery(\'#tagsdiv-<?php echo CTM_TAXONOMY_NAME; ?> p.howto\').hide();

        // bind our custom handler
        jQuery(\'#tagsdiv-<?php echo CTM_TAXONOMY_NAME; ?> input.tagadd\').click(ctm_custom_termadd_handler);
        jQuery(\'#tagsdiv-<?php echo CTM_TAXONOMY_NAME; ?> input.newtag\').keyup(ctm_custom_key_handler);
    });

</script>

<?php
}
add_action(\'admin_footer-post-new.php\', \'ctm_custom_tax_js\');
add_action(\'admin_footer-post.php\', \'ctm_custom_tax_js\');
?>