It works as described :-)

It took me a long time to find this, and I didn't find it through the extensions search engine, but through google.
Here's other ways to describe what I was looking for, and this module does it, after a fashion:
- several content blocks per content item
- split content blocks.
I was actually looking for a way to add more input boxes to the "new content" page. Using this module, instead of having several input boxes, you can create several pages with the same name + a suffix, and they will all be displayed on the same page.

The CMS "CMS made simple" has this feature built in, and it seems so obvious. I was surprised to find that doing something so basic is not possible in joomla.
I hope this is helpful for people who are migrating from CMSMS