Fixed last commit, form helper will work fine for self-submissions and normal URLs.
diff --git a/system/helpers/form_helper.php b/system/helpers/form_helper.php
index 8ed520f..5323097 100644
--- a/system/helpers/form_helper.php
+++ b/system/helpers/form_helper.php
@@ -51,7 +51,7 @@
 
 		if ($action && strpos($action, '://') === FALSE)
 		{
-			$CI->config->site_url($action);
+			$action = $CI->config->site_url($action);
 		}
 
 		$form = '<form action="'.$action.'"';