Tips for milling circuit boards with the RepRap host software using a McWire?

So, one of the main purposes of the original McWire was to mill circuit boards. I've been following the instructions for the McWire Cartesian Bot on the RepRap site, which built on the McWire design, and which is apparently generalized for RepStraping purposes and not necessarily for milling circuit boards.

My question is, can I use the RepRap host software to mill circuit boards, which is essentially a subtractive process, rather than building up an object layer by layer? Any tips for configuring the host software to do this?

im not sure about the reprap host software, but im using emc2 linux and the parallel port from my computer to drive my mcwire. it works really well, and is pretty easy to setup. its also very cheap as it doesn't need any other hardware than a printer cable, and a few ic's.