Probably easier to add a switch to exclude covers than it is to convert to optional plugin.
Found the code that actually generates the thumbnails (/src/calibre/library/catalogs/epub_mobi_builder.py) as well as the html template (/resources/catalog/template.xhtml). Might tinker with those (basically comment out/remove thumbnails altogether) and just run from source next time I need to create a catalog. Adding all the switches to the CLI and GUI is beyond me.
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