Why do we need a custom picker / why does the regular picker fire on scroll events? Should it be fixed generally on the regular picker?

A scroll event comes in looking just like a button press (but with a higher number). It does not seem unreasonable to allow these to trigger pick events in general but to disable them for draggable things specifically.

I don't think I understand this: "Pick" is logically selecting an element by clicking on it. No matter the technical implementation, why should scrolling ever be interpreted as pick? In what use case would that make sense?

pick is possibly an unfortunate choice of language. As an example of a picker that uses scroll, if I wanted to make an artist change size if the mouse is over it and scrolled, then giving a custom function toArtist.set_picker() would be the way to do this.