You can do some of your fancy formatting in Sigil. You can't do the "do this if portrait or do that if landscape" as that's not ePub. That's iBooks. But you can make the standard ePub look nicer as well by adding graphs, fancier headings, drop caps, etc.
But one thing to note, don't just take how it looks in Sigil as how it will look in ADE. Use ADE to see how it will look in ADE.
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