I feel with cross references that they are like 'the cherry on top" idea, not essential, but that they add to the overall flavor of the scriptures, and can also show connections and side branches that show more of the picture, and can be considered fascinating to read in and of themselves. The Joseph Smith Translations are incomplete, but still scriptural, they are put together by Joseph Smith by revelation, and if they were false the church would not allow them to be a part of the scriptures.
All I want to know is did we as a Church (by common consent) voted whether or not the cross references are scripture? (same with the JS translations). Based on that folks we will know the answer to that question.
Well that's the thing, does it matter? I don't think so, the church put the cross references in the scriptures for our benefit, and they are there to help increase our scripture reading experience. The same can be said for the Joseph Smith Translation, and the small paragraphs at the beginning of each chapter, the Topical Guide, and Bible Dictionary. They are there for our benefit, if the church had a reason for the church not to read and use these resources, they would take them out. As my seminary teacher tells me the cross references should be used to help use learn more from the scripture.
But that's the thing, the answer will be different for each member of the church, if one wants to be critical, then one could say nothing but the Bible, Book of Mormon, Doctrine and Covenants, and the Pearl of Great Price is scripture. But Ensigns, New Eras, Conference Talks, Joseph Smith Translation, exc. All have a place in the church. Just because one can say "They aren't scripture", does that mean they shouldn't be used? This is my problem with what you are asking, by asking your question, and if it's a no, it will then imply that they are of little importance.