It would be great if holding down both layer buttons for 3 seconds switched the upper and lower layers around ( on the Gemini). The lower layer is easier to access so I find it easier to work on that then ideally switch the layers.
I agree i would be a nice addition and thought about this too but, you can save the patch you did on upper layer then load it back to lower layer for accessibility sake. Swap could still be useful in perf mode if you want to edit more on the lower layer. let’s hope