Hide all register links and redirect to custom register link. For use with TNG User Meta version 1.X. https://github.com/HeatherFeuer/tng_user_meta

registration-redirect.php

<?php

/** 
*	Hide Default Registration
*
* 	This is for use with the TNG User Meta plugin: https://github.com/HeatherFeuer/tng_user_meta
*	Function 1 will redirect the user to the custom registration page when they visit /wp-login.php?action=register
*	Function 2 will hide all the links to the default register page. Even if the user does get there they will be redirected.
*
*	@author		Nate Jacobs
*	@date		1/15/13
*	@link		https://gist.github.com/4544797
*
*/

add_action( 'login_form_register', 'tng_user_meta_register_redirect' );

function tng_user_meta_register_redirect()
{
    wp_redirect( get_permalink( get_option( 'user_meta_register_start_page' ) ) );
    exit();
}

add_action( 'login_form_lostpassword', 'tng_user_meta_hide_register' );
add_action( 'login_form_retrievepassword', 'tng_user_meta_hide_register' );
add_action( 'login_form', 'tng_user_meta_hide_register' );

function tng_user_meta_hide_register()
{
    add_filter( 'pre_option_users_can_register', '__return_zero' );
}