If all you're trying to do is change the path for the login/register page how about something like this in your routes.php:
get('/register', array('as' => 'register', 'uses' => 'Auth\AuthController@getRegister'));
post('/register', array('as' => 'register', 'uses' => 'Auth\AuthController@postRegister'));
get('/login', array('as' => 'login', 'uses' => 'Auth\AuthController@getLogin'));
post('/login', array('as' => 'login', 'uses' => 'Auth\AuthController@postLogin'));
That's what I do but if anyone can suggest a cleaner method, I'm all ears.