My team is struggling with this as well. We are in the midst of a Jive 5 deployment, and have been looking for a means of featuring content in our forums and blogs. So far, the only solution that we have found is customization. As it stands, we have decided to forgo this functionality for the time being, observe the new behaviors on the site, and then decide whether the need is great enough to justify the costs associated with customization.
I mocked this up ages ago  Featured Content Promotion on Browse Place Content https://community.jivesoftware.com/ideas/2457 duplicated link if it breaks as it's an idea.
Featured stuff is at the top.