Hi Domenico,
– Limit to posts in these post categories: we are interested in indexing the news in all categories. Should we not select any category or should we select all of them?
Both will have the same effect: all posts in all categories will be included. The only difference is that with the approach of checking all categories, any new category will not be included (until you select that too). When no categories are selected, any new category will be included by default.
– Hierarchical post types: how does it work? Should we select for a news site?
That depends. Are you publishing all your news as Posts or do you use a custom (hierarchical) post type or Pages to publish your news? In that case, you’ll need the option to include Hierarchical post types.
We believe a small instruction manual would be useful to make the plugin usable by everyone, even non-technical people like us.
Agreed. We are working on improving our documentation while also preparing a big plugin overhaul at the same time.
In the mean time, please do not hesitate to ask anything you like on this forum, or via the support ticket system on this site 🙂