Would be nice if this existing setting could be used for it:

// Preview file contents when clicking on a file in the side bar. Double

  // clicking or editing the preview will open the file and assign it a tab.

  "preview_on_click": true

When set to false, it could enable the single-click-opens-the-file behavior.

Isn’t this controlled by this setting nowadays?

 // Preview file contents when clicking on a file in the side bar. Double

  // clicking or editing the preview will open the file and assign it a tab.

  "preview_on_click": true,