I really like the feature of being able to have as many colors as you want at a time, and being able to add or remove more colors. I would really love if this would also work for pen sizes! I use Goodnotes to take notes for class, and having handwriting sizes for heading, subheading, main bulk of notes, AND smaller details at once would be amazing without having to constantly go in and change the sizes of the pens. Even just a spot for recently used sizes would be amazing.