Hi Mellisa, 🙂
It would be indeed very nice to make this plugin compatible. As your idea could be a nice addition to our theme, we will implement this feature if other community members upvote your request.
As you know, the Register page cannot be edited directly. However, you can create new member profile field and choose to display them in the registration form. For more about this, please read the following post: Modifying the Registration Form.
Concerning your second request, we recommend My Private Website to make you entire website private. Simply install and activate this plugin, and then go to the plugin settings page (Settings > Private Site) in order to adjust options according to your needs.
If you need more help, this tutorial seems to explain every steps in great details: How to Make Your WordPress Blog Completely Private.
Best regards,