Suppose I'm preaching on the Psalm lectionary text for Palm Sunday, which happens to be Psalm 118:1–2, 19–29 this year. If I want to run a Passage Guide on that text I have to do the whole thing including the verses in the middle that are excluded in the lectionary, or else do it as two separate PGs. I'd love to be able to run the PG directly on that discontiguous set of verses.