Do you expect LDS-standards in submissions that are not LDS-related (for example in a fantasy submission, would you expect the characters to live LDS-standards)?
I am an LDS publisher, so yes, I do. Obviously your antagonist would be exempt from moral behavior, but your protagonist should be someone the LDS reader would respect and respond to in a positive way.
If you intend to publish nationally, then no, I would not expect the characters to live LDS standards—but I would hope that your main character would still be moral and ethical.
(See more here.)
I can’t help but wonder if the subtext to this question is: Stephanie Meyer gets away with some stuff and all the LDS eat it up. Why not me?
The answer to this question is that the LDS audience holds authors to LDS standards unless they become very, very famous and even then only within a certain range.