Set up driving relationships for your target shapes by either set driven key or the weight driver node, which can be used either as a vector angle reader or as an RBF solver.
Furthermore, SHAPES supports the default Maya pose interpolator which is available since Maya 2016.5 and later.
The weight driver is also freely available as a separate plug-in to allow full compatibility if you need to pass your scene to a client who doesn’t run a license of SHAPES.
Shape drivers can be created and removed directly through the interface.
Also, if a target shape being driven by a shape driver is currently selected, the current shape driver settings are displayed and can be edited at any time.