I've now been able to have such images zoom - on both iPod Touch and iPad - with the simple expedient of nesting a simple <div> directly inside the <body>. i.e. <body><div> ... </div></body>. Haven't tested this extensively, but it's worked with everything tried so far.
Another bit of iBooks lore I happened to discover, is that if you do something like
<a href="../Styles/Style0001.css">hit me</a>, touching the link yields a full screen image of the css text file, which you can spread and pan around as usual. This example from Sigil, and presumably works with any ordinary text file. Any ideas how to use this feature?
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