using arms in squats

[Squat1]

In this video at 9.10 Jim Schmitz advocates using arms.
Is this necessary?

http://www.youtube.com/watch?v=wgU95XfgSzQ

[Dastardly]

Sounds to me that he was mentioning the same elbows up cue that Rip uses. I dont really like the cue for newbs who dont have a coach because it often makes them over rotate their humerus's, with elbows WAY TOO HIGH, which destabilises not only the shoulder but the whole "shelf".

If a lifter definitely has their shoulders pulled back and DOWN in a strong solid position, then the elbows up cue can be appropriate.