Lonely Planet has a lighthearted wish list based on tons of passenger surveys:

Article I: The right to remove shoes
Passengers shall be allowed to remove shoes from their feet, but only if the aforementioned feet don’t stink or present health risks to other passengers. The right of the passenger to go to the lavatory without shoes shall not be infringed, as it is really your own business should you want to stand in the urine of others.

Article II: Freedom from unreasonable aromatic assault
No passenger shall, in the time of flight, be subjected to unreasonable aromas, be it from powerful perfume, foods redolent of onion, or other fragrance wholly unnecessary whilst on an airplane.

They go on to list another 12, plus show the data used to derive them.