It is on the development roadmap - that much has been previously said elsewhere on this forum.
IIRC it’ll involve something called a Flow Break which will tell Dorico where to put the relevant “front matter”.
For what it’s worth, I can’t remember the last time I saw a computer typeset part from Weinberger/MTI/Sam French that had numbers (even tags and play outs) starting down the page. Handwritten parts, sure, but not computerised ones - probably because Finale (and Sibelius) can’t do it easily or well.