This is brilliant, thank you so much MSC for your hard work. I'm using a UK (British) layout K70, and found that there were problems with two of the keys not working: # and \. I believe the former is not a dedicated key on US keyboards, and the latter is in a different place and has a different second symbol.
I've written a patch for this that seems to work well for me (Ubuntu 14.04) and submitted a pull request to merge this into your main branch. Hope it looks OK to you! If anyone's desperate for it, you can get my fork of the code here: https://github.com/bmerrison/ckb. You need to replace -DKEYMAP_DEFAULT with -DKEYMAP_UK on lines 15 and 16 of Makefile and then recompile in order to get the UK key map.
I'm also working on a little utility built on top of this driver to allow lighting patterns to be scripted in Python. It's pretty much just for my personal use, but I'll stick it up on GitHub and post a link here when it's working anyway...
