I see shadersource.hpss is it editable with some tools? How? Can shader overrides be distributed somehow via Workshop?

Im looking at possibility to change LDR to HDR in all shaders and mess with texture output to hack in dithering described here http://www.anisopteragames.com/how-to-fix-color-banding-with-dithering/ to simulate deep color and fight extreme color banding visible everywhere in dark areas of game (which is most of game).