jvstratum sorry, I should have phrased that better.
What we need is the ability to replace tags for modules.
Currently, we are using Acymailing 5 and we have a custom module which we use in all of our newsletters. The module helps us assign articles to newsletters (based on the publishing date and the category of the article). In addition to that it automatically adds section headings and a toc.
We would love to use Acymailing 6 but since we cannot use our custom module with it we cannot upgrade.
The "add articles by categories" in the new drag and drop builder is a great feature, but we need to have a date criteria as well.
A basic (fictitious) example would be a biweekly newsletter about cars:
Selected categories (# of articles): SUV (#2), Pickup (#3), Crossovers (#1), Sedan (#4) and Van (#0)
Relevant timeframe: 6th of January till 19th of January 2020
All articles are automatically added. For each category that contains an article a section header is added (no header for "Van category" since it contains no articles in the selected timeframe). And finally a toc is added containing all articles and sections.