Rebecca L. Sandefur is concerned about the legal system.But her pioneering research on access to justice problems, for which she was just awarded a fellowship from the John D. and Catherine T. MacArthur Foundation, goes beyond what makes it to court.Much of it revolves around everyday problems — think disputes with an employer, a landlord or even a phone service provider — that people may not even recognize as legal in nature.Sandefur, an associate professor of sociology and law at the University of Illinois in …