supercool awesome! I made some palettes (game boy,supercasette vision,c64,vhs) translated to 0-1 format from the official palettes in rgb format. Also black and white added to those palette. Works perfect, planning to do retro Amiga deluxe paint palette, nes composite palette. Anyway, I edit the .tres files directly, very nice custom editing done some heavy testing.
Color toggle using keyboard would be nice to have keys example 1. first color 2.back 3.forward 4.last color especially for tablet users so when using mouse or pen, left hand can toggle colors when drawing you dont loose focus of position. Also a little sound blip can be useful when toggling colors with option sound on/off ofcourse.
Thanks !