Yes ! thanks to Gades and XBOCT on bitcointalk.org I succesfuly compiled a modified versoin of CGMiner 3.5.1 which works with the Hashbusters Nano ! No need for the Virtualboxmachine anymore.
More details soon. Click here for a manual.
For now a screenshot:
After running for 15 minutes I see that the boards are running at a higher hashrate than before. In the Virtualboxmachine the run @ 2.5GH/s now with the new cgminer they run @ 2.7 to 2.9 GH/s. How cool is that ?!