Looks great. Allows you to create very smooth wave shaping curves. What would make it more distinct from other waveshapers? If the waveshaping could dynamically react to the imput signal, instead of remaining static and agnostic to the kind of input. So, some sort of modulation or side-chaining would be great.
Bootsy / Variet Of Sound has written about some interesting approaches to implement an analog-circuit like "stateful saturation" :