Comment 10 for bug 321740

Just saw the following on the pages of http://keytouch.sourceforge.net/ :
  When your keyboard is connected via USB you may have noticed that some extra function keys don't work. Note that most keyboard files in keyTouch are for a PS/2 connection and if a keyboard file is for a USB connection the name of the keyboard file will contain "(USB)". But still even if you are using the right keyboard file, some keys may not work. This is because the current USB input driver in the Linux kernel does not allow us to get these keys working. Currently I am modifying this driver so that we can get all keys working. This modification will be applied to the Linux kernel.
  So at the moment I recommend you to connect your keyboard via PS/2 and wait for a new version of the USB input driver. I will also write a new version of keyTouch that will work perfectly together with the new driver.

So yes - it's a Bug - and hopefully a new kernel version will fix it, and some new keytouch keyboard files mainly done for USB.