It probably depends somewhat on the field in which you apply, but my general answer is "yes". Research (in which you played a meaningful role, even if unpublished) probably counts, and publications in peer-reviewed journals always count. And I tell my own advisees that college extracurriculars may be helpful as well. What they tell me is that the applicant was able to multitask and have some balance in his/her life, but still did well enough academically to be accepted to a good medical school. And they may tell me that the applicant's college peers thought enough of him/her that they elected or appointed the applicant to a position of responsibility. Given the same degree of intellectual "fire power", I would rather have a resident who was well-rounded and had good interpersonal skills. But there may be specialties or specific residencies where that might not be as important.
from me. I'd be shocked if it strengthened your app at all, and if you put too much fluff into your application you risk diluting the whole thing.
