This is just a humble idea based on my experience as a user using the forum in Langoid.

I want to request a feature that can pin a reply so we can control on what the visitor will see as we ordered. For instance; there'd be a time when we are still in progress to write an article-like topic consisting of many replies and we want to keep the shape in order without any replies (on topic) from another user slipped in between. So pinned replies would be a help in that context because it will keep reading experience of the users better.

If there's happen for user to have a specific question on specific replies, my idea is to hid them, so another users won't immediately see questions in their reading section. It can be solved with adding one step like "Show all replies" under the on-topic-replies.