This looks like a solid compilations of existing randomization scripts (for eg some SWS stuffs, my
shuffle scripts and
spk77 ones ) into a unified and clean GUI... NICE !!
It seems your radiations are relative randomization (random range within an init value), I think it could be interesting to have more randomization control over distribution (like the
Gaussian approx in
spk77 script) so that the scripts become even more powerful.
If could be a mode toggle per parameter, which would extend the number of sliders for that parameter (actually, only mean and distribution sliders are needed for gaussian approx).