VariAudio "Pitch Drift" and "Elastique pro" algorithm

VariAudio has the “straighten pitch curve” option which corrects the out of the pitch center notes by bringing them close to pitch center thus straighten the curve.

I would like to have the option to correct the symetry of a vibrato related to the center pitch without making it less in quantity (like curve straightening does).
This is called “Pitch Drift” in Melodyne.

I also want to freely choose between “standard solo” and “elastique pro” for the variaudio editing.