When you click a scrollbar, if you wait long enough it shifts into "slow" (or "precision"?) scroll mode, as per http://blogs.gnome.org/mclasen/2013/08/05/scrolling-in-gtk/

The problem is that the delay for this is way too short. It looks like a quarter of a second or something like that.

In practice/regular use, and from experimenting by paying attention to how the widget behaves, I noticed that I click the widget and then start moving, however you have to almost *immediately* start moving to avoid triggering the zoom scroll behavior...

There is a physical limitation/delay between clicking the mouse and starting to move it. I would like the delay to be longer, maybe 1 second.