I think it would be helpful to have an option press a button or keyboard shortcut in the LLN interface to switch the main subtitles into selection mode - this would also ideally allow extensions like Zhongwen to recogise the text - it currently doesn’t even work with the sidebar.
This possibly isn’t so important in all languages, but being able to use third party extensions to quickly check the pinyin (pronounciation and tones) for the characters in the subtitles would really help Chinese learning.