Thank you. Forrest and trees. I had been looking quite intensly at that page full of options and still never noticed it. I even had work to do with the "hide empty verses". My bad.
I can report that PTXprint is very helpful; I got a lot done from first contact in two half-days, while learing about the concepts and where everything is. There is hope for an attractive publication.
One more feedback: The translators-team looked into the locally available Bibel versions today: Many do not show those verse 1, but a good number does render them indeed as 1. So apart from our special case, we need to make a decision. And with your answer, we are free to make the best decision, according to readability aspects, not limited by technology. Nice.