Themes do not apply to wp-register.php. A small enhancement to WP would apply themes to the registration page. This is what I am trying.
In wp-register.php I replaced the include of the config with wp-blog-header.php. In wp-blog-header.php I check for wp-register.php then load register.php from the theme.
The code at the end of wp-register.php does not run so I am inserting the code in to smaller files that can be included by wp-blog-header.php. When wp-blog-header.php sees the action register, it includes wp-register-register.php.
What do people think about implementing this back in to WP so that everyone can theme the registration page without modifying files outside the theme?