linuxcnc

I'm thinking of adding a MPG (Manual Pulse Generator) to my LinuxCNC PC to get me away from the keyboard and make life simpler. Has anyone added one? How hard is it to do? Do I need to change a HAL file (or something)? Which model of MPG?

Perhaps, I should ask this on the another forum, but I know you guys are very helpful and friendly. As I work on my power supply issues, I've been playing with the LinuxCNC GUI. Note that my motors are wired, but are sitting on my bench pending the ball screw, nut, bearings, mounts, etc...