Hi - first off, a massive THANK YOU for such a powerful app for the iPad pro. It took about a day to win me over despite two years of familiarity with other big apps. The capable brush engine and smooth experience with large canvases is something I've really missed.
My request is ergonomic in nature rather than cosmetic or feature-dependent. Minimizing the amount of clicking and hand movement for regular functions is really important to ensure a comfortable experience, which is the only real weak area of the app in its current state that I can tell.
The vertical color sliders are not without usefulness, but clicking and dragging three times to adjust a brush color in all three dimensions feels clumsy and unintuitive, let alone having to manually open the full color editor each time. I think the option to stick the square color map somewhere on the screen, especially in full screen mode, would be a negligible screen estate compromise for a big ergonomic payoff. A lot of painting involves repeatedly nudging the colors as you go along, and during long hours those extra clicks add up, a nuisance at best and contributing to the risk of RSI at worst.
Thank you for your consideration, and please... Don't stop working on this amazing app, it's a real joy for this wannabe artist!