We regularly see ranked maps with star rating icons that don't reflect the difficulty of the map itself. This gives the player the wrong impression of the difficulty of the map and looks pretty nasty and unprofessional, really. However, I do not think it would be beneficial for users to be given the ability to change this themselves as I see it as fairly unnecessary until a map is ranked.
BATs should only change the icon if a difficulty has been judged as been mislabeled, such as there being an obvious jump in difficulty between a Hard and an Insane difficult but both of them being labeled with the Insane icon. Modders do check that difficulty names themselves are not a misleading measure of difficulty, so it's really nothing new that needs to be taken into account by modders.
BATs should only change the icon if a difficulty has been judged as been mislabeled, such as there being an obvious jump in difficulty between a Hard and an Insane difficult but both of them being labeled with the Insane icon. Modders do check that difficulty names themselves are not a misleading measure of difficulty, so it's really nothing new that needs to be taken into account by modders.