While this doesn't really answer your question, I was really surprised the Lightzone could read flexcolor 3f files directly without converting to DNG first. Lightzone is a really interesting program as you can do a lot of things like dodge & burn, dust spot (I think), color correct, change contrast, etc etc BEFORE you develop the 3f raw file which I thought was really really neat. And just like flexcolor, you can change anything after the fact and just develop the picture again. It uses the concept of layers and masks just like photoshop but remember the masks are applied before the raw file is "developed" by Lightzone.
so.. how come Lightzone can read the 3f files but Lightroom can't?
Jonah