For some libraries it would make sense to use wide posters instead of narrow. For some libraries, especially if it has items which are not found by standard metadata agents, it makes more sense that the thumbnail is the poster. There could be a setting that is at the library level to show as Narrow or Wide.
Additionally there could be a setting for individual items. Library Default, Narrow, or Wide.
Wide thumbs are already shown for Web Shows and News so it seems like it wouldn’t be too difficult to add.
