I would like to offer the following as a basis for understanding the C* flight control parameter (law). The paper was written in 1993 when research into "FBW" was already thirty years old. As the paper suggests, this is primarily a military endeavour with precious little devoted to civilian transport aircraft. The author states he wished to change that. The paper is not easy reading but may lend a deeper understanding of C* laws and may therefore be of interest in the present discussion. - PJ2
The Application of a C* Flight Control Law to Civil Transport Aircraft - Edmund Field, College of Aeronautics, Cranfield University, Cranfield, Bedford, England