You can enable the post queue for new users in post settings, but if you want to queue everything in one category you have to turn to plugins.
I actually created one that might help a little: https://github.com/oplik0/nodebb-plugin-category-queue
But because it was created just for my needs it only queues topics and not every new post (if you post something in a topic from that category it won't be queued, but if you create a new topic it will).
It can be easily modified to do that tho (look here for explanation on how to get cid from such a post).
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Is there a plugin that can hide part of the content?
<login>login to see here<login>, hide some post contents,like download links for login users.