简单的回答是：没有办法控制下拉列表中显示的内容，没有可用的过滤器。希望在未来的版本中会有所改变。

一个可能的解决方案是创建您自己的元框，其中列出您自己的模板数组中适合当前页面的模板，并将选择保存为post meta。然后将过滤器添加到page_template 检查该元值并加载该模板。

EDIT- 下面是一个完整的工作示例，代码改编自add_meta_box codex page. 你唯一需要改变的是$wpa70686_custom_templates 大堆格式是要使模板可用的页面ID，然后在这些数组中是文件名（减去.php), 以及下拉菜单中显示的名称。

// page ID, template filename, template display name
$wpa70686_custom_templates = array(
    42 => array(
        \'custom1\' => \'Custom Template One\',
        \'custom2\' => \'Custom Template Two\',
    ),
    96 => array(
        \'custom3\' => \'Custom Template Three\',
        \'custom4\' => \'Custom Template Four\',
    )
);

// add the meta box
add_action( \'add_meta_boxes\', \'wpa70686_add_template_box\' );

function wpa70686_add_template_box() {
    add_meta_box(
        \'wpa70686_template_box\',
        \'Page Template\', 
        \'wpa70686_render_template_box\',
        \'page\',
        \'side\'
    );
}

// display the meta box on the apprpriate pages
function wpa70686_render_template_box( $post ) {
    global $wpa70686_custom_templates;
    wp_nonce_field( \'wpa70686_nonce\', \'wpa70686_noncename\' );

    if( array_key_exists( $post->ID, $wpa70686_custom_templates ) ) :

        $current_value = get_post_meta( $post->ID, \'_wpa70686_template\', TRUE );

        echo \'<select id="wpa70686_template_box" name="wpa70686_template_box">\';
        echo \'<option value="default">Default</option>\';

        foreach( $wpa70686_custom_templates[$post->ID] as $template_file => $template_name ):

            $selected = $current_value == $template_file ? \' selected\' : \'\';
            echo \'<option value="\' . $template_file . \'"\' . $selected . \'>\' .$template_name . \'</option>\';

        endforeach;

        echo \'</select>\';

    else:
        echo \'no templates for this page\';
    endif;
}

// save the meta box value if it exists
add_action( \'save_post\', \'wpa70686_save_template_box\' );

function wpa70686_save_template_box( $post_id ) {

    if ( defined( \'DOING_AUTOSAVE\' ) && DOING_AUTOSAVE ) return;

    if ( !wp_verify_nonce( $_POST[\'wpa70686_noncename\'], \'wpa70686_nonce\' ) ) return;

    if ( \'page\' == $_POST[\'post_type\'] ){
        if ( !current_user_can( \'edit_page\', $post_id ) ) return;
    } else {
        if ( !current_user_can( \'edit_post\', $post_id ) ) return;
    }

    if( isset( $_POST[\'wpa70686_template_box\'] ) ):

        $new_value = $_POST[\'wpa70686_template_box\'];
        $current_value = get_post_meta( $post_id, \'_wpa70686_template\', true );

        if( $current_value ):

            if( \'default\' == $new_value ):
                delete_post_meta( $post_id, \'_wpa70686_template\' );
            else:
                update_post_meta( $post_id, \'_wpa70686_template\', $new_value );
            endif;

        else:

            add_post_meta( $post_id, \'_wpa70686_template\', $new_value, true );

        endif;
    endif;

}

// load the custom template for pages with the meta value set
add_filter( \'page_template\', \'wpa70686_custom_template\' );

function wpa70686_custom_template(){
    global $wp_query;
    if ( $template = get_post_meta( $wp_query->queried_object_id, \'_wpa70686_template\', true ) )
        return locate_template( $template . \'.php\' );
}