Open in Dual Display

I really like CTRL+double clicking on a file to open in a dual display. My question is when I changed the command OPENINRIGHT=vert to OPENINLEFT=vert I get the same result. I there a command I can use to CTRL+double click to open the selected file in the left display?

That setting changes what happens when you middle double-click the file display background.

It has no effect on double-clicking files or folders. To change what happens when you double-click folders, have a look in Settings > File Types > All Folders > Events. There's a Left dobule-click + Ctrl event in there which you can edit.