You'll want to listen to the filter:categories.build hook. You can remove all of the code creating the route override.
use write api with q&a plugin to create a topic as a question?
I have the write api plugin installed as well as the question and answer plugin. We are successfully creating topics and posts. Is it possible to create a topic as a question? I tried adding isQuestion (equals 1) to the POST body when creating the topic but it was ignored. Would the write-api have to be forked and updated to support the optional value of isQuestion? It seems clear in the question and answer plugin that it doesn't create/expose any write api of its own.