Indeed, lying to TeX is quite easy, either with titles that just contain a zero-width or non-breaking space (there needs to be something),
Or you could even put something like this in ptxprint-mods.tex
\makeatletter
\sethook{page}{-4}{\mark{\t@tle}}
\sethook{page}{-5}{\mark{\t@tle}}
\makeatother
Which ought to convince TeX that page -4
and -5
(iv and v) start with a title, even if you actually have a very long paragraph going from page 3 to page 5 without a break. (hopefully you don’t!).
But if you want the change to occur everywhere, then it makes sense to not lie about what’s on the page, but to tell it what you want it to do.
If at present you have a page number on the top-right of odd pages and top-left of even numbered pages, then to make all non-title, non-verse text have page numbers at the middle-bottom, you’d want to say something like:
\def\RHnoVoddright{\empty}
\def\RHnoVevenleft{\empty}
\def\RFnoVoddcenter{\pagenumber}
\def\RFnoVevencenter{\pagenumber}
-
RH
means running header, RF
running footer,
-
noV
means no verses. There is also title
for title page, and nothing in that slot means normal pages.
-
even
/ odd
is referring to the page numbers,
-
left
/right
/center
are the 3 the position within the header / footer.
For those that want learn more cryptic commands, the documentation is here.