We don't have 92,000+ people constantly yelling throughout the game either. Making an entire team feel uncomfortable on their own sideline for the entirety of the game is just as great as making an opposing offense uncomfortable in scoring situations in one end zone.
I am in favor of adding chairbacks on the student side, just as long as it's not to the detriment of the stadium's energy level.
Edit: Just a to counter any potential counter-points, I know this is a necessary step of being "big time." We, as fans, need to be shown how to be big time. And that means not sitting down for half of the game, or being annoyed that someone in front of you is standing up.