Instead of the current Upvote - Downvote mechanic, I suggest having multiple "reactions" to a topic, for example:
All Users: Like, Dislike, Genius, Funny, Off-Topic, ...
Moderators/Admin: Promote/Stamp of Approval
- Every user can toggle any of the reactions available to him/her.
- The post would then show how many of each reaction it has.
- If a post has too many dislike / off-topic it can slowly be faded out.
The third feature actually already exists as a plugin haha http://community.nodebb.org/topic/744/nodebb-plugin-dwnvtr-downvoter-plugin
The reactions feature I've seen before, would be nice as a plugin