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i usually use Goodnotes for PDF so sometimes objects drawn with pen tool are difficult to see. therefore, i suggest new type of pen which has edged line like lazer tool.
my another idea is adding wavy and double line to pen or shape tool. now i can draw only single lines to highlight words / sentences. However it seems there's lack of function. thus we need wavy and double line tool.

allow the user to draw a determined stroke and then allow the user to set that as a stroke type for a line he draws. like if the user wants to draw a wavy line where two are parallel to one another or draw a line that is just a repeating design like with a dotted line that uses for example the drawing of an ice cream instead of the dot.

Would be great if drawing a smooth wave wouldn’t snap into a zig zag line all the time

I want to add a waveform (=underline of waves)

hello, you can add: 1) Ruler (for mathematics and graphs). 2) Dictaphone according to the text. 3) Eyedropper and transparency brush. 4) Written by hand in printed text. 5) Drawing tools. 6) Not only straightening lines, but also wavy lines, zigzags. 7) The ability to turn the sheet with your fingers (upside down, sideways, etc.).