We have a resource library in wordpress, using discourse as a commenting system. It would be a big help for us as well to provide a simple thumbs up/thumbs down rating system for each resource, which we’d also prefer to see happen in discourse than using some wordpress rating plugin.
One idea I have looked into is allowing voting in polls directly by email, or the ability to share polls in various places including other topics, PMs, etc. This doesn’t exist yet but I think it would go a long way to increase engagement.