Hi Ethan, I just met with the admissions director at MSUCOM yesterday and I can say that absolutely-they want a letter of rec from someone who knows you well. It can be your next door neighbor. They are really interested in your personal life (I'm not kidding-she asked me about my boyfriend and listened with great interest to aspects of my life not related to medicine for about half an hour, till finally I felt like I had been talking way too much "well, thanks for meeting with me"). Don't get a letter from someone with an impressive title unless they can write a really sincere, heartfelt letter of recommendation. She said the interview would be pretty much like my meeting with her was.
MSUCOM is one school-you can feel assured- that really wants to know who you are, and they understand its hard to develop an indepth relationship with someone you've shadowed a few times, thats why they don't care if its from a DO.
I was lucky, my volunteer supervisor wrote me one of those great letters-the thing made me blush! They want specific examples of the five things they ask the writer to comment on (and I told my supervisor this)-examples of communication skills, maturity, understanding of osteopathic tenets, I forget the other ones. I didn't decide till recently to apply DO, so I had to write a little paragraph for my supervisor letting her know what I had done to research osteopathic medicine-so that she could honestly say she knows what my understanding of it is.
Well, hope that helps-don't be impersonal with this school at all, feel free to be yourself (what a nice, relieving feeling)!