THere are a few topics that could benefit from this. Pinning a certain reply to be the first one you see under the main post, for example:
Artists of the community has had an issue of people posting art claiming it as theirs. If this was pinnable by TL4 and higher, or the topic’s creator. This could also be a quicker way to get important info to the top of a post without going into edit mode and using copy/paste to get it onto the main topic, or going into edit mode and quoting the info.
I’ve misread that as topics.
I’m not sure that it’s possible because of the way discourse displays posts in general.
When you enter a topic you go directly to the last post, and only a dozen of the above posts are loaded to increase page loading speed. So above posts are not loaded unless the user scrolls up there.
So I’m not sure if it’s possible, but I’ll think about it