Is there a way for an admin to exclude a new forum post from going to the top of recent activity feeds?

For example, my site discusses current events. One feature we offer is an ARCHIVING of local news posts which we want post to a specific category. Our forum page though sorts by all categories and so when we post something that is a relatively meaningless update (but still important as an archived article) it floats to the top of the list and can supplant otherwise popular topics at the top.

Is there a way to post a forum post as an admin, but essentially have it stay at the bottom of the list - until people start to comment inside the post if they do. Problem is, most of these don't even inspire conversation so it is just a distraction that they flow to the top of recent activity feed.

Could you maybe allow toggle of what categories feed into forum? So I could still maintain a category with archived stories for reference but they don't come to the top of recent activity feed? Feels useful to be able to separate certain utility categories like this that won't inspire conversations.