Version 0.5.1 is up.
First, I have added more options and details for filtering units using resource as filter criteria.
Second, you can start testing the "Extract scenario" function. It's started from the file menu.
Select some civilizations, the start and end era, click on preview.
Then, click in one of the yellow field with the numbers, to see the list of buildings, units, techs, etc.
Normally, it should list everything that your scenario should include to work properly, and exclude everything that you will not see in your game because you can't build it.
So for instance auto produced units will be included.
Custom maps and custom players are not yet supported for this tool, it's made for random games.
Also, there is an option to include the units that no one can build; That's because in my mod, I have "template" units with a full civpedia explanation, and then flavour units.
For instance, there is a "swordsman" unit, that no one can build, with some description, and then 20 flavour version, where the civpedia just say "flavour unit of the swordsman", with a link to the swordsman.