If I was looking for guidelines in interpersonal relationships, I would look first to Sha'arei T'shuva, M'silas Yesharim, Chafeitz Chaim, etc. I would not look in Hilchos Pesach; and I would obviously not even be glancing down at the footnotes. If I were looking for how to treat a corpse with proper dignity, I'd probably go to Yoreh Dei'ah somewhere. (That's a lie; I'd call R' Fuerst; but bear with me, please.) I know it is important, though, because of a Rashi in Chumash; where he notes that even the kohein gadol on his way to do the avoda of Yom Kippur would be required to first take care of a meis mitzvah. That's astounding! As important as the avoda of the kohein gadol on Yom Kippur is for all of Klal Yisrael, it does not take precedence over the kavod due a simple Jew whose corpse is lingering unburied; no relative or friend close enough to take care of his last needs in this world, so distant from the community that even the chevra kad...
This is a paraphrase of the pasuk in t'hillim 84:7 -- "mei'chayil el chayil" -- which means "from strength to strength". In this case, it is my thoughts and ideas to those who are strong enough to be interested :)