I use the Wacom tablet and have a key that shows the Structured Keywords Panel via Alt+CMD+K. I also have one that shows the Keywords Panel via CMD+K. For the Keywords Panel, I merely have to press the Wacom key to show or hide it. For the Structured Keywords Panel, I can press the Wacom key to show it, but I have to switch to the keyboard or use the mouse to hide it. It is not as efficient. Sometimes I want to hide all of the panels so I can look at the contact sheet without any overlays.
I certainly accept your decision on how it should work.
Rich