It would be very useful to be able to look at all the pages of a comic as thumbnails and select one of them to be the cover page. I have many old scans where the first image in the cbr/cbz is the 'brag image' of the scanner rather than the actual cover, and this makes looking for a particular issue by cover flow very difficult. I could go in and repair those cbr/cbz files manually, but a simple override in the page selected as cover means not having to learn how every freaking container format works.

There is a way of doing this in YACReaderLibrary, just edit the comic information and use the arrows on the cover image. Is not the faster way but by now it does the job.