Edit Book: Syntax highlight links, images, stylesheet includes, etc. Links that point to missing files are marked as errors. You can Ctrl + click on a highlighted link to jump to the file it points to directly.
Edit Book: Check Book: Add a check for manifest items missing href attributes.
When clicking in the search box, select all existing text, for easy replacement.
Edit Book: Add buttons to change the text alignment of the current paragraph. If you do not see them, go to Preferences->Toolbars and add them to the Text formatting actions toolbar.
Improve performance of rendering the book list when lots of column coloring rules are used