I don't think that Tolkien would have edited anything for anyone except himself. In the Letters, he has written quite a few times, "complaining" about all the revisions that his editors were trying to make. He hated revisions, and if confronted with an issue of political correctness, he would have just told the world that he didn't mean to insult anyone, because he didn't.
As for the whole Arabic/Muslim thing in PJ's The Two Towers, it was done on purpose. The costume designers have been quoted as saying that they based the costumes for the Easterlings and Haradrim on the medieval Saracens. They didn't want ot insult anyone, and I don't think they were. Is imitating clothes an insult? If it is, then I think that all of Hollywood should be considered insulted, considering the lengths that some people go to to imitate celebrities' wardrobes.
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But Melkor also was there, and he came to the house of Fëanor, and there he slew Finwë King of the Noldor before his doors, and spilled the first blood in the Blessed Realm; for Finwë alone had not fled from the horror of the Dark.
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