Dimensioning tangent spline handles independently

I'm trying to figure out how to dimension the middle tangent spline handles with different values. See attachment. SolidWorks allows me to drag the handles independently, but the moment I add a dimension it fully constrains them both and I lose the ability to drag them independently. I am only permitted to add one dimension value for both handles. Is it possible to add independent values to each tangent handle?

I do a lot of dynamic dragging of the spline handles in my models to tweak things to fit within other parts or assemblies or to give me enough draft angle on a surface. It would be much easier to tweak tangent handles independently with a dimension value instead of just eyeballing them.

SW2012 sp 5.0

SolidworksSurfacing