I add words and phrases to the word list even when reading physical books; It would be great to be able to add a source manually to these entries so that the book title would appear in the list of texts on the left side of the word list and for the entry to be available for selection to allow practice
How about this: instead of adding the words directly to the Word List, go to your library and do an Upload Text with just the title of your book. Then open the (empty) text and enter the words you want as you come across them using the Edit page in the sidebar. Close the sidebar and click on all your target words. They will then be all together, linked to that book title, and available for practice at the end of the uploaded text. Furthermore, the book title should then appear to their right in the main Word List. I often do this with vocabulary lists or sentence collections.
Many thanks for the work around - works perfectly. ReadLang just got even better!