Just interviewed for a program (completely unrelated to research) where I was asked to explain why I didn't publish on some research I did. Honestly, I think it would have been better if I didn't put that on my application at all. Sure research might help a tiny bit if you don't publish, but it doesn't impress anybody. It is easy to do. Another faculty member (M.D.) has asked me why I ever wasted my time on bench research because you don't do squat. His words.
Looking back, I would have never done bench research my entire life. Its not that I didn't find it fun some days, but because "intramural basketball" has had more favorable comments during interviews. I would have done minimal shadowing also. My leadership experiences and medical mission trips were the highlight of every interview I had. I guess because it is unique.
Inteviewed at 10 medical schools with 2 interviews each. While in medical school, I've interviewed for 5 programs. Approximately 25 interviews. The only good thing I've heard about any of my research - 1 article I've submitted for publication that is pending review. The non-paper stuff - 0 good comments. The ph.d.'s I've done bench research under weren't nobodys either.