A general tagging field on content items would allow for related items (posts, pr, actions, etc) to be displayed across a site. It could be used for other purposes as well, but the main reason would be to allow for interlinked content in the CMS portion of NB.
It should be fairly easy to add, especially if the specific implementation of the related items was left to customizers in the NB community as an advanced function.
This is something we will consider but does not have a timeline at the moment.
However we are paying close attention to the most popular suggestions so please share and encourage others to follow and comment!