Support setting light level slider to use alternate scales

I have found myself wanting to have a logarithmic scale slider for my dimming lights. The top 50% is visually very similar, and the bottom is vert sensitive. It would be great to be able to set the input to logarithmic, but barring that, even having that as an input slider option that I could map to my light would be vert useful.

@viertaxa, did you find a workaround for this?