I am wondering how to create irregular lines suggesting various noisy gestures or dynamic for improvisation. Something like in the picture bellow, which is the best I got to so far using the available symbols:
Dorico is not at all suited to contemporary graphical scores. At the risk of being condemned as a forum heretic, you can achieve this easily in Lilypond, with postscript paths, import of graphics and other markup commands. That may or may not be helpful!
I look forward to Dorico potentially having good drawing tools in the future.
I found the lines with repeatable objects tend to work fine to convey a sense of irregularity as long as one doesn’t mind their periodicity as @Andro points out and the fact that they are often rather too long for them to be precisely aligned (which probably wouldn’t be an issue in a situation suggested by Jesper when they span several bars).