Is there a reason why the mist settings aren't handled by the world-texture in blender? Why you manually have to write your own FNI? The mist values seem to align pretty well.
Currently getting some ink on my hands over at the Guild Of Ink-Makers (PyPRP2).
So far nobody has bothered to write the code to tie it in to PyPRP. As well, Plasma mist settings to not match up with Blender mist settings and clear colours.