Update Banner Image for Media Threads

When creating a media thread the banner image remains the same, even if new media is uploaded to the thread. As an artist I might start a threat for a work in progress, and post progress of the image as I go, it would be nice if the tile display would show the NEWEST one not the FIRST one. Especially since artists or similar can use this as a small live-work gallery of what they are currently doing and people may just view the channel page as a quick update and never see any thing beyond the initial image since it is static.

On the Media Threads have a toggle that allows the banner to be changed to display the NEWEST media posted in that thread, alternatively perhaps allow a right click menu option on uploads within that thread with the option 'set as main image' or similar wording to allow updating of the banner image.