// remove tag base
add_filter('tag_rewrite_rules', 'no_tag_base_rewrite_rules');
function no_tag_base_rewrite_rules($tag_rewrite) {
$tag_rewrite=array();
$tags=get_tags(array('hide_empty'=>false));
foreach($tags as $tag) {
$tag_nicename = $tag->slug;
if ( $tag->parent == $tag->tag_ID )
$tag->parent = 0;
elseif ($tag->parent != 0 )
$tag_nicename = get_tag_parents( $tag->parent, false, '/', true ) . $tag_nicename;
$tag_rewrite['('.$tag_nicename.')/(?:feed/)?(feed|rdf|rss|rss2|atom)/?$'] = 'index.php?tag=$matches[1]&feed=$matches[2]';
$tag_rewrite['('.$tag_nicename.')/page/?([0-9]{1,})/?$'] = 'index.php?tag=$matches[1]&paged=$matches[2]';
$tag_rewrite['('.$tag_nicename.')/?$'] = 'index.php?tag=$matches[1]';
}
global $wp_rewrite;
$old_base = $wp_rewrite->get_tag_permastruct();
$old_base = str_replace( '%tag%', '(.+)', $old_base );
$old_base = trim($old_base, '/');
$tag_rewrite[$old_base.'$'] = 'index.php?tag_redirect=$matches[1]';
return $tag_rewrite;
}