Hello,
I managed to get build Processor Expert versions of the Freescale USB CDC stack.
http://mcuoneclipse.wordpress.com/2012/05/04/usb-cdc-goes-medical/ has added MCF51MM256 support, and the attached version supports Kinetis K40 and K60.
The TWR-Kinetis K60 adn TWR-Kinetis K40 projects work as expected (there is still the fundamental issue (in the stack?) about sending/receiving a lot of data).
However, for the KwikStik one I only can send data to the Kwikstik, but not back to the host? I'm not sure if this is a problem of my board, as there seems to be many revisions of that board, and I have Ver 5 one.
Hope this helps,
BK