Now Skybox is on the corner to view image both lcally and remotely (via SMB). And I know that now Skybox could customize thumbnails by naming it matching videos or folders. On top of that, I would suggest adding folder.jpg to show folder images.
Once we could viewing pictures remotely. Adding this feature would be easy to do and useful to users. At this moment, users can have fast rendering and meaningful thumbnails. And with an option to disable the auto thumbnail feature can save the video scanning time as well.
Thanks