Editable path smoothing for pencil and brush paths
I'm proposing smoothing that may be applied or removed after a path has been created with the pencil or brush tool by the user. When a path is being created, the program would capture necessary coordinate information and the path would be represented on screen as drawn, or with a certain amount of smoothing (set prior to drawing in tool panel). If the user wanted more or less smoothing applied after creating the path, the amount could be adjusted by selecting the path and changing the amount applied. If the path would no longer need adjusting, it could be expanded to save potential file size.
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It looks a lot like a paid plugin DynamicSketch by AstuteGraphics.
There are videos at YouTube with demonstrations.
Is is close enough to what you want?