I would like a quick brush palette where context toolbar settings (width, opacity, flow, hardness) and current color could be saved as a "brush swatch" (tm). There would be a preset number of boxes (8 or 10?) where you could store your brush swatches. When you click a plus sign in one of the boxes, the before mentioned settings are saved in that box, along with a small illustration of that particular brush with the color.
This way I could switch quickly between drawing tools while working - it would be so intuitive and fun! I follow NMA.art classes. It would really add speed to drawing and make it easier to follow the lessons if I could quickly change between main drawing tool and writing tools with different colors for notes on my drawing, like anatomy courses for instance. For example, a sepia pencil for drawing the anatomy, and a blue pen for bone names, red for muscles and yellow for tendons/ligaments. Great selling point for those starting out with digital painting/drawing.
I added a beautiful piece of art that I spent about 5 days drawing to illustrate my idea