Technically speaking, that was never part of the requirements. According to the original author of the plugin:
After installation, when you edit a category in the admin section you will notice a select box. Simply choose the permission level you would like to set and then all questions in that category will be hidden from users of lower level.
And that was it. If requirements are respected, by definition, there can't be a bug :)
Anyway, I've just published v1.1.2 with this feature. I was lazy enough not to test it much, so please, go ahead and test it yourself.
I've also added category-level privilege checks. To understand this, it works in the following way. Imagine this:
- A user is a Registered user (basic level)
- In a given category, they are promoted to Superadmin (only for that category!)
- In the plugin, that category is set only to be accessed by Administrators+
In this context, the user will be able to view and post on that given category.