I don't know how hard is to increase the maximum size limit for brushes. But something I miss on Paintstorm is the possibility to work with really big brushes, to adjust big areas with an airbrush, or using big base textures, etc. I work with A3 canvas size, and the maximum brush size barely cover 1/4 of the short side of the canvas
Some other suggestion I would say is:
1- The posibility to keymap up to 5 or 9 brushes on each category, that could increase the work flow insanely
2- Implementing a customisable gamut tool in the same color wheel (Such a button to switch both modes) Such as:
Thank you for making this program so great