Plugin for fman.io that gives you the ability to move/copy selected files to the other pane
You can install this plugin by pressing <shift+cmd+p> to open the command pallet. Then type install plugin. Look for the MoveToOtherPane plugin and select it.
After installing MoveToOtherPane, you will have the ability to move or copy selected files directly to the other pane.
<Alt+m> - Move selected files to the other pane.
<Alt+c> - Copy selected files to the other pane