Is there a G5 menu customization error?
"Picture setting" includes aspect ratio, but is not limited to it. With "picture setting" you have to navigate through more options; with "aspect ratio" you simply select from 4:3, 3:2, 16:9, and 1:1. The G5 allows you to assign "aspect ratio" to one of its function buttons, but does not include it as an option for quick menu customization, which is odd.
I'm amazed, though, that no one has responded by saying they see the same behavior that I do when scrolling through quick-menu customization options -- a "hidden" set that shows for a split second as the user scrolls from the next-to-last to the last set of customization options.