Feature Request: Add possibility to use the numpad for controling the process

[Build-0-Matic]

Hi!
It would be super cool if there was a possibility to control the adjustments for density-cyan-magenta-yellow-move to next-move to previous using only a small external numpad, a bit like on the Fuji Frontier SP-3000 instead of having to use the default keys on the big keyboard.

Here is the illustration of the pad used on the Fuji machine (from the instruction book)

Thanks!