Are parametrically driven Face Curves (an actual Tools -> Sketch Tools -> Face Curve) possible

Hi all,

Before I submit an enhancement request, I was just making sure that this is not possible.  Face curves can be created in a mesh or as a percentage of the face.  If I can create as a percentage, I would like to be able to change that percentage, updating the position of the face curve.

Thanks!

P.S.  Does anyone use face curves?

SolidworksSketching