For what its worth you can do with DPP, so I imagine you can with NX. I slightly wonder why you would want to as part of the idea of RAW is that it is, like tiff, lossless, in fact more so because the camera has saved far more info in a RAW file than is needed for any single extraction of the image. It could be useful for further manipulations in programme other than PS; PS keeps changed items going lossless in .PSD format; only problem is that each layer is as big as a .tiff file. I might occasionally do it to carry out very large cut-and-paste operations (eg replacing one face in a group from another image where the guy moved and its not a tri-pod identical base pic) which I would do in mac-only 'Color-it' as you can perform all manipulations on a selection 'live' over the base, maybe other PC progs work similarly.

Sorry for ever having called you Horace, Stephen!