i work mainly in manga studio and there is a tool called lasso fill. This tool acts like a lasso tool where you draw a shape and upon releasing, the shape is automatically filled with a color.
Is this kind of feature in harmony? If not, then why not? I think its a extremely useful tool and should be available in harmony. It is especially good for lineless styles and huge time safer unlike the current pencil tool where you have to draw first the invisible line and hope the paint tool will fill the area because of gap issues. Also when there are many invisible lines in the way, you gonna have to use the paint tool multiple times to fill the desired shape with the color.
If the pencil tool or even the stroke tool had a feature that autoconnects both ends and automatically fills the shape with a color, it would be great.
Many companies also like using animations that use lineless style so it would be a popular tool to use.
I think its a must have addition to the drawing tools.