In his editing for the 1837 edition, Joseph Smith frequently changed the historically past-tense (or subjunctive) modal verbs might, would, and should to their historically present-tense (or indicative) forms may, will, and shall. As noted under 1 Nephi 3:19, Joseph Smith’s apparent motivation was to avoid the modern-day tendency to interpret the past-tense modals as conditional, hypothetical, or subjective. Such editing, however, has been sporadically applied to the Book of Mormon text. In virtually every case the original past-tense modal will work, and there are still examples in the text of that usage. In general, such past-tense modals should be restored. For a complete discussion of these historically past-tense modals, see modal verbs in volume 3.
Summary: Restore the historically past-tense modal forms might, would, and should whenever the earliest textual sources support their occurrence.