I really don't see the need to add a bunch of new preferences for Zooming. With the exception of the occasional accidental zooming (like this one), its just not a really a problematic or common issue.
Maybe I'll make a note about the different behavior of zooming an undocked Preview widget in the User Guide, but otherwise, that section of the guide (under User Interface) seems fairly clear to me.
Quote:
ZOOM
On the lower right of the main window is a zoom control that lets you shrink or enlarge the text and images independently in Book View, Code View, and the Preview window:
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EDIT:
https://github.com/Sigil-Ebook/sigil...2403ac0fdc7afa