If I am not mistaken this is not programmable.
No doubt this is still a very good deal for most people, but I guess I'm happy with my Access--IS pads.
From what I can tell, the 630 is just a standard keypad. It just so happens to have MX switches. Brand new it still seems to fetch anywhere from $45-$55. I bought one of these because I wanted a cheap mechanical pad to use with my HHKB at work. I use a nice-quality DSI one at home. $18 and change shipped is better than I would have expected. Hopefully the seller ships reasonably quickly and the pads are in decent condition.