In addition, when using the paintbrush to paint "special rooms", the left-click of the mouse also "trigger the crafting window" of said rooms/bench... it is a little unsettling! ʕᵔᴥᵔʔ
Thinking about that, i would make the paintbrush "standalone" (no interfering with crafting) paints with left click , and deactivate too the normal right click (remove object on said tile) to quickly pass to the next color! ʕᵔᴥᵔʔ It seems smoother that way (and intuitive?!). Moving the mouse to select the tiny square for a color is a little cumbersome i observed! ʕ-ᴥ-ʔ An easy alternative like right-click should help! <3