The only case where it is needed to indicate to the user that angle and/or radius is split is the case where both tangents are collinear and have same length. In any other case, the tangent value (radius and angle) is itself indicating that the radius or angle is split, so no new indication is needed.
For that case I propose to make the handle connector dashed, instead of continuous line. I think it introduces less chaos in the handle drawing.
-G