I would like the possibility to, whenever you go to the first page of the FAQ's (where the categories are), have some text there. I could use this for example to explain what this FAQ is and what you can find in each FAQ.

Similar, when you make a new category, you can also input a description there. I would like this to show whenever you are in that category, above all the FAQ-items.

Is that possible? This extension is already super, by the way, and really what I need! Just trying to make it a tiny bit better!

Yes, that is one step. To see category description when viewing a category.

But I would also like to be able to put a description at when you are at the FAQ-frontpage (so where you select what category you want to go in to). Now it just shows "FAQ categories" and then the categories. I would like to be able to have some text in between FAQ categories and the actual categories. Perhaps I want to put something there to explain what each category is or whatever.

So descriptions/texts at two places...

I second that idea. The ability to have a paragraph (HTML allowed) above the FAQ cats on the first page would be great. In my instance I would use it to ask users to please check the FAQ before submitting a ticket to the ticket system.