Lots of plug-ins provide the shortcode in a way that it can be copied. It’s not a feature that you don’t.
The dropdown of categories does not happen when adding a FAQ. I have to type in the entire category name and if I make a mistake in typing, then I have a new category.
I am trying to build a website in which a non-computer person can add/edit FAQs. Your plug-in is too complicated in its execution of the add/edit functions. That’s what I meant by “it doesn’t work right”. Make it easy for people and they will use your product.