Your comments

FYI, the Goto Anything panel selection color can be replaced by editing your theme's quick-panel-row-selected.png and quick-panel-row-selected@2x.png.

With the addition of "preview_on_click": false in Build 2210, I think most people (if not all) will expect that a single click would move focus to the file/folder side bar. With the option disabled, the click has no function.
With the option enabled, there might be some argument that a single click is for the preview and not setting focus, but certainly by convention this does not seem like the usual behavior in either OSX nor Windows. I have no experience with Linux.