I don't believe there is a plugin that will allow you to do that while creating a category.
However, this fork of the plugin should disallow asking for questions: https://github.com/pupi1985/permission2categories
It will also hide the category itself, but it is unclear to me if that is your expected behavior or not.
Welcome to the Q&A site for Question2Answer.
If you have a question about Q2A, please ask here, in English.
To report a bug, please create a new issue on Github or ask a question here with the bug tag.
If you just want to try Q2A, please use the demo site.
April 20, 2021: Q2A 1.8.6 released!