Could the tau be substantially different from e and mu in the supersymmetric standard model?

R-parity stands as an ad hoc assumption in the most popular version of the supersymmetric standard model. More than fifteen years' studies of R-parity violations have been restricted to various limiting scenarios. We illustra te how the single-VEV parametrization provides a workable framework to anal yze the phenomenology of the complete theory of supersymmetry without R-par ity. In our comprehensive study of various aspects of the resulting leptoni c phenomenology at tree-level, we find that the physical tau lepton could a ctually bear substantial gaugino and higgsino components, making it very di fferent from the e and the mu.