Grease pencil Line assistant tool

I have an idea regarding the improvement of the grease pencil. It is a tool to help draw with the grease pencil in 3D space - Krita software has a similar tool: You can add more like :

• sinusoidal lines, exponential, and logarithmic lines in order to use them in velocity animation;
• comics type hashes;
• special drawing with brushes on a mesh surface - like Surface Painter software.

Even if they can be made with other elements from the blender 3D software, using a grease pencil can be simpler.