If you know you are going to be outputting only B&W files, consider configuring the camera to write both a JPG & RAW and designate the color space to monochrome (B&W). This will give you a quality preview/review of your shot in B&W and you still have the RAW file if you eventually need color. If your shot is well exposed for many situations the JPG will be adequate. The M8.2 renders slightly different than I tend to do manually in B&W conversions with PS CS3. I find it interesting to compare the results.
ALSO, if you plan to shoot only B&W, consider leaving off the UV/IR Cut filter or substituting with a common UV (skylight) filter. The added IR in the file makes for some interesting levels in the shadows, seemingly more shadow detail than should be expected, sometimes not and only typical shadow detail.
Unless you plan to shoot a 28mm or wider, lens coding isn't really an issue as it serves primarily to correct color shifts in the corners which can also be corrected in post with CornerFix.