I was reading the question "Is this site just for Bible-based questions and answers?" and I answered it with this question, so I thought it might be better suited as its own question.
If a question is asked that does not does not specifically say "what does the Bible say about X" would an answer that quotes from a non-Biblical Christian source of scripture be welcome? For example if the answer was given based on the Book of Mormon (the book of scripture, not the musical)?
Likewise, if a question was asked about a point of teaching in the Book of Mormon, would that be considered on topic? I picked the Book of Mormon because it specifically says "Another Testament of Jesus Christ" on the cover, but yet is only accepted as such by a small minority of Christian faiths. I am sure there are other books that are considered to be Christian scripture by members of some faith's but not others.