Do you want to know how the CSS WG works? Fantasai has written about:csswg, An Inside View of the CSS Working Group at W3C.
image-fit: auto;issue at Opera’s request:
fillfor everything else, and mark it as possibly removed in the future.
image-positionto CSS3 Image Values, mark as possibly moving again to CSS3 Generated and Replaced Content once that draft is under active editorship.