"s2Member has control..." is displayed purposely by the s2Member plugin. We added that in there to help avoid confusion with this native option in WordPress.
The "Anyone Can Register" option is controlled by s2Member, and can be modified by changing the Allow Free Subscribers option under s2Member -> General Options -> Login Welcome Page -> Allow Free Subscribers. There are some additional details there, along with a link to the registration form.
If you set "Allow Free Subscribers" to (on), the registration form will be open to the public, and the default Role is always Subscriber. When a paid member registers after checkout, s2Member recognizes this automatically, and assigns one of the s2Member Roles, based on which Level of Membership was purchased.Statistics: Posted by Jason Caldwell — May 6th, 2010, 9:29 pm
]]>