Cool. It looks like the equivalent of xmodmap for OSX.
The problem with the PLU on mac might be the keycodes it puts out. I read somewhere that both the PLU and the Noppo's have issues with OSX by default and that it's likely because of the controllers they use ... that they actually show up as two controllers instead of one. I've never tried either with my Macs, just trying to post possible reasons why there might be issues.
Also this project looks like a newer one that has more support (it looks like Double Command hasn't been updated in a while and the author suggests using this as an alternative if it doesn't work for you):
http://pqrs.org/macosx/keyremap4macbook/
