yes, you can run pigment inks in this printer, with all the conscious considerations such switch over would mean - in terms of different ink properties like gloss, gloss differentials, bronzing which may become more prominent or not, very much depending on your ink/paper combination.
Technically it works, I have a R265, an A4 pre-predecessor running on pigment inks since a long time, and other people run special B/W pigment inks on this model as well.