感谢Niall Campbell提供的multiple galleries插件提示，也感谢这个问题How to Add a Custom Colum on Thickbox Media Gallery Tab? （我从哪里弄到的钩子admin_head-media-upload-popup 从），我能够完成任务。

我添加了一个选项来添加style 属性设置为库短代码。

以下是完整的代码：

add_action( \'admin_head-media-upload-popup\', \'wpse_53803_script_enqueuer\' );

function wpse_53803_script_enqueuer() 
{
    if( $_GET[\'tab\'] == \'gallery\' ) 
    {
        ?>
        <script type="text/javascript">
        jQuery(document).ready( function($) {

            // append the table row
            $(\'#gallery-settings table#basic tbody\').append(\'<tr><th scope="row" class="label"><label><span class="alignleft">Style:</span></label></th><td class="field"><select id="style" name="style"><option value="standard">Standard</option><option value="slideshow">Slideshow</option></select></td></tr>\');

            // set our vars
            var $style = \'\', $is_update = false;

            // Select parent editor, read existing gallery data 
            w = wpgallery.getWin();
            editor = w.tinymce.EditorManager.activeEditor;

            if (editor !== null) {
                gal = editor.selection.getNode();

                if (editor.dom.hasClass(gal, \'wpGallery\')) {
                    $style = editor.dom.getAttrib(gal, \'title\').match(/style=[\'"]([^\'"]+)[\'"]/i);
                    var $is_update = true;
                    if ($style != null) {
                        $style = $style[1];
                        $(\'table#basic #style\').find(\'option[value="\' + $style + \'"]\').attr(\'selected\',\'selected\');
                    }
                } else {
                    $(\'#insert-gallery\').show();
                    $(\'#update-gallery\').hide();
                }
            }

            // remove standard onmousedown action
            $(\'#insert-gallery\').attr(\'onmousedown\', \'\');

            // Insert or update the actual shortcode
            $(\'#update-gallery, #insert-gallery, #save-all\').mousedown(function() {
                var $styleAdd = \'\';
                if (editor !== null)
                    var orig_gallery = editor.dom.decode(editor.dom.getAttrib(gal, \'title\'));
                else
                    var orig_gallery = \'\';

                // Check which which style is selected
                if($(\'table#basic #style\').val() != \'standard\') {
                    $styleAdd = \' style="slideshow"\';
                }

                if ($(this).attr(\'id\') == \'insert-gallery\') {
                    w.send_to_editor(\'[gallery\' + wpgallery.getSettings() + $styleAdd + \']\');
                }

                // Update existing shortcode
                if ($is_update) {
                    if ($styleAdd != \'\' && orig_gallery.indexOf(\' style=\') == -1)
                        editor.dom.setAttrib(gal, \'title\', orig_gallery + $styleAdd);
                    else if (orig_gallery.indexOf(\' style=\') != -1)
                        editor.dom.setAttrib(gal, \'title\', orig_gallery.replace(\' style="slideshow"\', $styleAdd));
                    else
                        editor.dom.setAttrib(gal, \'title\', orig_gallery.replace(\' style="slideshow"\', \'\'));
                }
            });

        });
        </script>
        <?php
    }
}

非常感谢。