Hey! Turns out my estimate was way off - I just pushed an update with the option to quantize and dither the screen colors in the CRT effect. Just choose the Custom RGB Sliders option for Color Ramp Mode, and all the relevant options should appear!
10 days ago(+1)
Noticed a tiny bug with the dither pattern scaling (nothing too bad though) if you have the game view resolution set to something not 2x the reference resolution (or you have the pixel scale set to something weird), the dither pattern pixels get weirdly squished around. Better explained by the screenshots below where the first one is with 1920x1080 and the second one is with 2560x1440. I have scale in screen space turned on and the vertical reference resolution set to 1080. Seems that the dither pattern scales with the scanline/rgb size slider.
