The Calibre Manual implies that selecting multiple books requires users to be able to use keyboard and mouse at the same time:
https://manual.calibre-ebook.com/gui.html
Quote:
* You can perform Actions on sets of books. To select multiple books you can either:
* Keep the Ctrl key pressed and click on the books you want selected.
* Keep the Shift key pressed and click on the starting and ending book of a range of books you want selected.
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However-- at least for me-- it's possible to select multiple books by clicking and dragging.
The manual should probably mention that.
And-- at least in MacOS-- it's impossible to use Sticky Keys for keyboard+multiple click combinations.