Why not count win/cmd/menu keys?

In the heatmap, the win/cmd/menu keys are shown in white color, without counting. When I switch to "keys" from "Heatmap", I can see there is a Key called "Unknown", whose amount increases after I hit the win key. There is also an unknown keycode after I export the csv file through the export wizard.

So why not add these keys to the heatmap?


Best,
Bowei