This is my point. You think that a 'national position' is impressive, noteworthy, etc. in and of itself. Most people drastically over estimate how good their ECs are or how good their LOR are. Happens in med school apps as much as residency apps. It isn't about padding, it is about other skills or qualities that other people don't have.
My point is, what does having a "national position" mean in terms of what you bring to the table that others don't? I would argue very little to nothing. If you mentioned it to me at my program, I'd say, "Okay, so what else do you do with your time?" That isn't to say that someone who does those things can't have great skill sets derived from those experiences or other intangibles. But, saying, "Well, they didn't go for my NATIONAL position, therefore ECs aren't that important" is simply wrong.
Leadership isn't about the title or what you preside over, it is about how you lead and the results that you obtain. It doesn't matter what realm it is in, local, regional, national, internet based etc. If you are productive, you will be valued.
I would say 3/4 of the residencies that I interviewed at (18) had at least one person who asked the details of different ECs and how it would impact what I could contribute to the program. I mean we talked rocketry, programming, rock climbing, suture labs, research... I even had a PD ask me to rank them high in a follow up e-mail after interview based almost entirely off of my work on one particular EC.