Numpad
If I press [ctrl + alt + shift + 4] with numlock enabled, Excalibur understands [ctrl + alt + left]
If I press [ctrl + alt + shift + 4] with numlock disabled, Excalibur understands [ctrl + alt + shift+ left]
Not Numpad numbers
Regardless of the modifiers, [4] is also interpreded as ['], even though on the UK keyboards the symbols of the [4] keys are [$] and [€].