Hi James,
Unfortunately SkylineCMS doesn't have that feature. What we usually do in such a case is make a custom controller for users to sign up and login.
In the CMS itself we make one page the root of our secure pages. We then create a Setting to identify that page.
This might look like:
root
|- page 1
|- page 2
|- Secure page root
|- secure page 1
|- secure page 2
| page 3
In our pages_controller we check wether we're on that page or a child of that page and perform the necessary actions.
I hope this helps.
Kind regards,
Luis