I'm only a casual and occasional user of Sigil so this is largely idle curiosity but this business of only saving valid ePubs raises a couple of questions for me. How easy is it to get into a situation where your current document isn't valid (i.e. won't save) and there's a non-trivial amount of work to either fix or undo it? In such a case I would want a way to save my current work-in-progress, perhaps in a custom format to make it clear it's not a valid ePub.
Then again it's possible this doesn't really arise, or only arises with an unusual work-flow?
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