I know that the manual of ModelConverterX is lagging behind the development release a bit. This is actually on purpose, since I only update it when I make a new stable release. But I do realize that this means that many features are undocumented at the moment. Since reading manuals is not something every user does, I am trying a new approach now. I have opened a YouTube channel on which I will regularly post short videos to show how certain functions of ModelConverterX work.
So hopefully that will make it a little easier to use the tool. And on the plus side, it is also quite nice to make such little videos. Of course the manual will still get updated when I make a new stable release.