One suggestion for the GS shelves. Lose the middle 3rd rail! It is useless and only makes it harder to put stuff with center track rollers back on the shelves. I have no idea why they think you need that center rail, clearly I won't be powering anything up on the shelves! That's really my major complaint with the product!
That would require a change to the extrusion die which may not be possible or might cost a lot of money to do.