Does a Reroll crew work with a crew such as Jean Desailly/George Washington Lebeaux etc.? I am unsure based on the Pirate code verbiage regarding rerollers. “You may re-roll crew abilities, provided that the effect of that ability applies to or is used by the ship.” Since the effect would be moving the enemy ship I am not sure if it counts.
Yes, you can reroll those abilities because the ship and its crew are using the ability, even though it does affect others.
That clarifier is meant only for some specific edge cases, like Marines, which operate independently of the ship despite being transported on it. The rest of that PC entry names a few other things that can’t be rerolled; there may be one or two others floating out there, but I can’t recall any at the moment.