[eluser]Bionicmaster[/eluser]
hi, in function to avoid mandatory use of MY_Controller, I tried with your callback functions inside Auth class, and just call it from Controller as the same name:
<code>
function register_user()
{
return $this->auth->register('admin/register_user');
}
</code>
and then, Application is optional, because you can implement this or another personal controller of your choice.