Hey Wayne, I think you mean Alt S and Alt R
Yes they will reset the Scale and Rotation (Alt G will reset the location)
You would use these all the time when animating an armature, because it will be in Pose Space – not so much when animating objects because they will be in World Space.
You don’t need Alt A, or Ctrl A for animation.
Alt A is for deselecting everything…..ok so you might use that.
But Ctrl A is for applying stuff….and no, don’t do that unless you want to break your animation 😉
