Just thought it might be neat to add a blend/smooth tool and a paint tool to the maker pen. For blending/smoothing, we can blend and smooth shapes that are touching or colliding with each other to make them seamless. It would be perfect for character making and terrain. For painting, it would be a simple option to paint on shapes as if you had a brush or pen, with adjustable options of colors, materials, and size of brush. (This might be a stretch but possibly a pressure feature of the brush would be helpful, so it’s not just a constant one size stroke. Some strokes can end in a point as if you’re using a fountain pen.) I’ve attached some photos of how it would look.
