EldritchCellar (EC) is right (as usual). The pen seems stills to be the best way to get things done for inking and coloring. The geometric lines is for preview rendering only. Still it's improved quite a bit over the toon mode. I can see some people might be willing to use this for their comic as things are done in real time. Speed is not something to be overlooked when you have to crank out scene after scene to compose a page. I know person uses one scene per page for their comic and he's going to get a dramatic speed boost over someone like me that composes one scene per panel.

I remember jwtoons and having something that can assign cel shading values to an entire scene with darkening the entire scene too much is very valuable. Thanks for the links, EC.