Here is my current situation. I am trying to select the selection inside via CMD+SHIFT+L so I can move the gold coins around a bit. But I don't seem to be able to do so. Select -> Float seems not select it either.
Ctrl-Shift-L would indeed work on other systems.
Alternatively, you can use
Ctrl-V to detach the area from the layer, move it around with the Move tool, and then anchor it back with