Technically speaking, it is a completely separate input value than the regular 1 2 3 4 5 keys and we only support one key. Those ones are more commonly used and thus were chosen.
I believe it's possible to find a 3rd party application that "remaps" keys on the PC that can take the input from any key and make it internally press a key of your choosing which would then allow you to assign a NUM pad key to the regular number keys when they are pressed. There is potential for a small amount of lag from this and we also can't recommend any third party tools for such a thing but google may be able to help you.
Best of luck!
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