Deoldify Vapoursynth filter

[Dan64]

I like your proposal, having grouped the parameters with the same scope helped going in this direction.
I have only the following observations: 

1) the lists for filters "Chroma smoothing/stabilizer" start with a boolean flag to enable them.
    When the list is checked/unchecked can you automatically change the flag to True/False ?

2) Can you dedicate to the parameter "Darkness" a dedicated GUI params like "Chroma Limiter" ?

Thanks,
Dan