Just remember, the people who review apps go through thousands of them, all with at least two LORs. If another one doesn't add something really interesting, they're more likely to resent it than to say "Gee, this person has lots of people who like him", so unless it clarifies a situation or adds something not otherwise noticeable, use with caution.Will the academy allow you to submit more than 2 LOR.If so,how can you do it?