I don't know but iPhone users have used a js bookmarklet to change the apple-touch-icon before they save the bookmark. I also know that iPhone respects the apple-touch-icon-composited (IIRC) so that the phone does't add it's own shape and shine to the icon. The same bookmarklet could be modified and used on the N9 (don't know if it respects the composited attribute) to use the webpage provided icon without trying ro squircle it.