Quote:
Originally Posted by Ghitulescu
Therefore the ability to mark a text document as a cover is not only handy but also required. 
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But it's NOT "required" it's permitted.

The EPUB2 spec has no standard for dealing with cover
images, so I would think flexibility would be desirable in an editor to help accommodate varying device/app implementations (plus there's the fact that calibre's editor is not JUST an epub editor).
You've also managed to argue your way right into supporting the idea that the actions of "marking" a cover page|image should remain independent of each other. In your examples, you don't NEED the image to be marked as a cover image ... you only need to indicate the cover
page in order for it to display properly on the devices you indicated. So why would you want calibre's editor to automatically mark the image as well when you don't need it to?
Never mind the fact that calibre's editor also allows the editing of AZW3 kindle files -- which use
images as covers and NOT html pages.
There's seriously
more reasons for keeping the actions separate than there are reasons for pointlessly (and quite possibly detrimentally) linking them. You not seeing them doesn't make them any less valid.