Vic,
With the wide open unobstructed (no walls or fences to lean up against) courses we race on, I do not think even after a crash the car could end up stationary and balanced on the drivers side, or the passenger side. (short of a Joey Chitwood stunt show, I did not feel this situation would occur)..
The most likely situation would be a spin resulting in lift causing the car to flip, roll or tumble... coming to rest on the roof or the wheels. Not likely on it's side. We did design the cage with this possibility in mind,, so that it would not lay flat on its side,, also with a middle roof bar that is raised above the A to B bars. promoting a "Roll" back to the wheels.
But then again this is just all theory,, every crash situation is differant.
So YES you are correct the side supports should not limit exit from either side. On the Stude my side helmet supports are the same length on both sides. They are the length that does meet the new rule wording and also are as long as they can be allowing me to get in and out quickly.
As to passenger side exit ?? Look in a bunch of Race Cars,,,, LSR, Drag, Various Circle Track cars, Road Race, SCTA, Mud race etc,,,, I think what you will find is most all of them have much more "stuff" on that side making exit or extraction much more difficult than from the drivers side. But I know you knew this already.
Charles