In my experience, number pads aren't very easy to use for gaming, pretty much the same as using the keyboard but worse because it's further. Although you dislike the gaming pads, they're made for a reason and will be better than other non-intended devices. Another option, of course, is to use key binding on mice, but depending how you hold your mouse while gaming (I use a fingertip hold with my palm very close the the back), it may be awkward.