I realize I am replying to a 3-year-old post, but I want to ask: Why was this desired in the first place? I do not see this in engraved scores; I see the content fit within the margins, not staves aligned across pages as such. It would seem to be a habit of music software, rather than an engraving tradition.
From a user’s point of view, it seems strange that Dorico does such careful work avoiding collisions between staves but throws up its hands when it comes to margins. An honest question: How different would it be to avoid margin collisions too? If the choice were offered, I would never use the current way, and I doubt many others would either.