I've been using grip tape on the back-strap of my early R9s, and have found no discoloration when it is removed. My gun has the stock Rohrbaugh anodized finish, which has held up quite well over six years of daily carry. There is a tiny spot of holster wear to the anodized finish on the front edge of the frame. Other than that the gun looks like new - with over 2,000 rounds down the pipe!
Yankee2500's black grip screws definitely look classier than the standard 'white' Rohrbaugh screws.
Having the back strap stippled will require refinishing the entire frame, and that's what has stopped me from getting it done.
If, or when, the holster wear bothers me enough, I'll probably send it to Robar for stippling and refinishing.
Steve