Lens distortion models

For computer vision and machine learning, there is often very helpful to generate synthetic datasets using Blender, etc. It often comes in hand with specific camera distortion.

I think it would be nice, to add other widely used distortion models. Even better would be to add an option to define custom lens distortion models.

I would very much like like to be able to use the rectilinear/fisheye in this form: link

Because there is not an option for rectilinear lens distortion, I had to use the fisheye polynomial model, which unfortunately does not correspond to the OpenCV fisheye model: stackoverflow link

Is there any other way to get the rectilinear distortion model into a camera? If there isn't I would be interested in helping with the development of such a feature/extension.

Other users would welcome such a feature: forum link