Sigil's Code View editor is not likely to evolve into a "more powerful" html-editing IDE. It's just not in the cards. Especially when those more power html IDEs already exist, and can be used to edit the html of Sigil epubs via the Open With feature.
Sigil is more of a tweaking/polishing tool than a creation-from-scratch one. Those who have need of a full-featured html editing software package should use one of the ones that already exist to create the html for their epubs (or use the Open With feature of Sigil to edit xhtml files in their favorite full-featured editor). We're not looking to reinvent the wheel on html editing.
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