Venti: There is no Ring 2. Below Ring 3 is the Grand Ring, where the seats are loose and can be arranged however you like. The other Rings are more strongly raked than at Roy Thomson Hall - especially Ring 5, where your feet almost line up with the shoulders of the person sitting in front.
But I agree about the front rows having less leg room.
Patrons aren't allowed in once the performance has begun, and it is an established custom in theatres for people to move to let others pass. More passing room would be nice, but it would set each row of seating further and further back from the stage and defeat the benefits of having a small, intimate hall.