This is actually supposed to be in the game, and was mentioned by Kurt Benkert among other people in the hyping of the game before it released. The feature does not work in CFB 26 though. If you change these things and then return to the player edit screen sometimes they revert to their original stance. Even when it does register the change on player edit page, sometimes it doesn't show up properly on the field.
My guess is that EA caught wind of the issue in CFB 26 and took the feature out of Madden entirely before the game's release, and they're only going to add it in whenever they make a fix for it.
