The method for creating or editing the horizontal alignment with tangents and curves is done far more easily in other CAD platforms so I go that route on such projects, but would prefer to stay on Civil3D for more of my files. If Autodesk could create an improved table editor for modifying alignments to allow for curve creation/edits with input fields for length, Station PC/PT/PI, or radius/degree of curvature life would be much, much easier.