Here is the skinny on LTU (flew them 1st class on my honeymoon to the Maldives awesome) You cannot EARN miles on LTU flights but you can SPEND your Qualiflyer miles for LTU flights.
http://www.swissair.com/qualiflyer/membership/spend.htm

I was very impressed with their service on both DUS-MLE and MLE-FRA. I would gladly fly them again.

BSL