Ancient Justification for Modern Practice

Kevin Barney’s post over at BCC has me thinking about the ramifications of female Apostleship (capital A): What it would mean if we came to agree that the New Testament bore strong witness to there having been women in roles now held only by men?* The question, when placed within the larger framework of our penchant for finding ourselves in the past, presents an interesting dilemma: Could a future opening of the Priesthood to “all worthy persons (not just males)” find scriptural justification for itself in the same way that we see the Book of Mormon in such difficult places as John 10 and Ezekiel 37?

As is well known, we are fond of justifying our ban on homosexuality with reference to Leviticus 20:13, but have no qualms about neglecting passages such as Lev. 19:27: “You shall not round off the hair on your temples or mar the edges of your beard,” or 17:10, where anyone who eats meat with blood in it will be excommunicated. (Note that the “ban” on homosexuality is part of the “Law of Moses” …)

So here’s a question: What are some issues not currently part of LDS practice for which one might find justification in the scriptures? (This question is more about discerning our use of scripture than about calling for social change.)

*A good place to start for female apostleship is Anne Brock: Mary Magdalene, The First Apostle: The Struggle for Authority.