How about flightgear which is packaged for debian. For super bonus points make the klik installer auto install local scenary based on the locale and by default start you at a local airport

I'd also wonder if it wouldn't be usesful to have klik installers for the games which are shipped with Knoppix, so remasters can happily remove them when space gets tight, knowing they should only be a klik away. Frozen Bubble especially is always tempting to remove thanks to its size (though it's just so nice).