I have tried this..
lower the actual fatigue rating of rb, dt, de, and any other players you want to see a rotation for to 0 in the roster edit section. set your auto subs to what junit40 has in his slider thread... make sure all players in the position you are setting to 0 have their actual stamina set to 0 and this will give you a blend of subs without keeping your star out. You will also see yellow fatigue icons when you do this.