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Calibre's ebook viewer allows the customization of fonts by serif, sans-serif, and monospace for example.
I made another section on my test epub to show how I understood OP's question. Personally, I'd like the heading and body text to still be customizable, and not just a "standard font", then serif, sans-serif, and monospace. Maybe separate standard fonts for body text and heading? If the book doesn't specify any font families or types for those elements. Then allow the user to customize fonts by type as well. But would that be too much? How do other users feel about that?
In my test epub, since Calibre's ebook viewer doesn't allow customizing the standard font for the body text and heading separately, the two headings and the text below with no specified font family both show in monospace font since that's what I set in "Standard font".
Readest has similar font customization, though it doesn't seem to show the designated serif, sans-serif, and monospace fonts when the CSS only specifies serif/sans-serif/monospace.
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