Update [07.01.2016]: I am releasing a new version of my stacking software, which is ambitiously named "s1.00". It is designed to only work with the newest hardware version, h1.2. This new software and hardware should make the rail much more universal: it now independently operates both camera's shutter and autofocus, so in principle should work as is (or perhaps with slight parameter adjustment in stacker.h) with any camera which has a wired remote shutter connector. The modifications will also likely result in faster maximum shooting speeds attained with your camera: e.g. my Canon 50D can now reliably do at least 30 frames at 4 fps (RAW format), without any perceptible delays at the beginning.

My wiki tutorial has been updated to reflect all the changes: