Well obviously, but again, why? Is it strictly for one handed data entry, or do you find it easier to move your hand from the home row to the numpad when enter

Well obviously, but again, why? Is it strictly for one handed data entry, or do you find it easier to move your hand from the home row to the numpad when entering a number mixed with text? (I.e., is it that common for touch typists to not touch type numbers on the top row?)