Cover Flow - preview image for videos and folders

Hello,
Is there any way to change the still image used as a preview for a video file in Cover Flow in the Finder? I've found that browsing through folders full of video files, it mostly shows me black previews, or previews containing bits of text (opening credits).
It would be useful if I could select a still frame to use as the preview, so that I can actually tell at a glance which video I'm looking at -- the filenames are not particularly useful in this regard. I have all the files tagged for use with spotlight so that I can search them easily, but would still like to be able to find the files visually as well.
Similarly, I have folders full of images. Is it possible to replace the generic folder icon with one of the images contained in that folder, so that I can see which set of photos is in that folder?
I haven't been able to find anything about this, so I'll assume for now it's not possible. Any ideas if this might be a future feature?
Thanks,
Johannes.

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Cover Flow - preview image for videos and folders

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