1. The first question that I'd appreciate advice on, is about how it handles ca for a known Nikon lens.
2. I frequently need to process batches of files for HDR pre-processing for these panos. I know there's a batch file tab, but surely it's not necessary to set up batch processes for such a simple one-off requirement?
Question 1: Go to the Edit List. Look in the Develop Section. Look in the Camera & Lens Corrections. You probably have Auto Color Aberration checked. (That's good. Leave it that way.) The manual says there is also a Fisheye Tool that only appears if you use the 10.5 or 16 mm Fisheye lenses.
The manual isn't very helpful. You'll find some discussion of this topic in Jason Odell's "The Photographer's Guide to Capture NX". If you intend to use NX2, his eBook is an excellent resource.
Question 2: I edit one file, copy the adjustments, then paste them to the rest of the files. Use NX2's browser and the Batch menu. You don't have to open the remaining files -- NX2 chugs (slowly) through the other files and applies the settings to each in turn. I think I had it save each as a tiff to a separate folder. One of the knocks on NX2 is that batch processing is not great. But it does work. BTW, same advice about looking at Jason's book for a much more complete explanation.
I'm doing this on a Mac but I think it would be much the same on your computer.