Ok,
I think your questions put me in the right mindset. So I'd like to confirm what I've found.
The Self-registration login and the Web Login are completely independent of each other. Is this correct?
I was hoping that I could present the Login for Self Registration and then the user enters AD credentials and it would authenticate. I believe this is where my hang up was.
Instead I need to present them with the Web Login. This will perform a RADIUS auth against CPPM where I can use the Auth source of AD to authenticate users. However if they dont' have an AD account, then I need to redirect them to the self-register page and they would log in via the Self Register login page.
I'm working through the scenario now to see if this works. Let me know if I'm on the right track.