Not that I know. Unfortunately som skill enhancing items do not WAD anyway, like the repair enhancing statue. Their effect was intentionally removed long ago for to me no apparent reason.
I`m totally with you(see one of my recent posts) on pirates accosting/attacking me being also a pirate as if I were not. Very bad for immersion and yes I know that some pirates were mortal enemies and some attacked everyone. Gentlemen of Fortune they were known as AFAIK. They are represented by Bold Privateers in game now but ordinary pirates should leave their collegues be.