Ive been testing a new plugin out called "Maven Member". This plugin does some really nice things and works well with WP Pro Quiz.
1. The plugin can be setup to let users register WITHOUT the admin having to enable the new user account. Once the User creates an account, the user just logs into their account and can have access to higher privileged content.
2. Admin selected pages and posts can be configured so that only registered people can view page or post content.
3. When registering, you can specify what information you need to collect. Username, Password, First Name, Last Name, Phone Number, Address, ect
4. The plugin controls both REGISTRATION and User Logins.
5. If the WP Pro Quiz, is setup to only be viewed or executed under a registered user, This plugin will show a login box/registration link to allow the new user to register to your website.
Try the plugin out, let me know what you think