您介意使用标签的“描述”字段作为SEO标题吗？如果是：

add_filter( \'single_term_title\', \'wpse_60464_title_from_description\' );
function wpse_60464_title_from_description( $title )
{
    if ( ( $obj = get_queried_object() ) && ! empty( $obj->description ) )
        $title = $obj->description;
    return $title
}