Prevent registration except through form

I found a good answer and slightly modified it on a related question . It uses htaccess, and redirects any requests to wp-login.php?action=register. 

# BLOCK SPAM REGISTRATION REQUESTS (wp-login.php?action=register) 
<IfModule mod_rewrite.c>
RewriteEngine On
RewriteCond %{THE_REQUEST} ^.*(wp-login.php\?action=register).* [NC]
RewriteRule ^(.*)$ http://isoreiki.com/about/account
</IfModule>

Notes:

  1. In the answer I linked to he totally blocked these requests. However I have redirected them to the Formidable Pro signup form, as you can see in the RewriteRule.
  2. As far as I know, all regsitration attempts, even wp-register.php, will go through wp-login.php?action=register.
  3. I have tested signup using my Formidable Form and it’s still working fine. Also, wp-login.php, including lost password, is still working.

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