You probably noticed that this thread is relatively old and so I guessing that vical is not around to answer your questions. Most UNISA doctoral programs do not require you to be on campus. Some accomodation must be made for your dissertation defense (skype, etc.) Accreditation should not be a problem but many people have their degrees reviewed by a credential review service to demonstrate equivalency. I've never heard of a UNISA degree falling short of it's US counterpart. It's worth it to spend some real time browsing through their website because virtually all these questions are answered there and it will be more assuring to hear the answers from the school itself. By the way, don't bother trying to email them. They can't possibly answer emails from thousands and thousands of casual inquiries.
did some stuff at Wentworth Institute of Technology
doing some stuff at the University of London