With the latest version you can create hotkeys now.
Here is an example of how I modified the calculator.
I open the calculator.xml and added the following within the skindata section
This now will make the calculator appear if you press Ctrl+Alt+C and Hide it if you press Shift+Ctrl+Alt+C.
The number 67 represent the letter C when the keyboard button is pressed where the shiftkey='ACS' represets Alt, Control, Shift key combo.
Have fun.
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