Hi,

The short answers to your questions are:

1. I can add this in the next week or so. The mathematics is already in the code, I just need to find a GUI layout that is not too complex.
2. This is not currently possible, unfortunately, since it is not in line with Blenders main functionality and purpose. There is an idea how to program it, but I will likely not implement it in the near future.
3. This can not be done by OptiCore, which is an addon only for generating the geometry. Dispersion (and any other material property) is handled by the render engine, such as Cycles or LuxCoreRender.

An additional note I would like to make is that you should be very careful about the results when using 9 aspheric coefficients. Because Blender's geometry handling, as well as all the render engines I am aware of, are limited to 32 bit float precision, you may not get the desired accuracy - depending on what your application is.
You will have to judge yourself whether a comparison with a dedicated optical design software is needed in your application.