I've had a nice reply to my Email to the readers' editor, from Pamela Hutchinson, viz:
Thank you very much for getting in touch about the Cryptic crossword layout straddling the fold in the main section -- you are not alone in expressing some anguish about this!
We wanted to let you know that editors will definitely be taking a hard second look. Any change to a segment such as this can have knock-on effects not immediately apparent from the reader side, so revisions are not a simple matter … nonetheless, your point is definitely receiving serious attention.
With luck, solutions will be found (pun intended).