How do I copy the results line by line to Word?
For now “Side by side with English text” is your best option if you are going to copy it somewhere else. For best results you will have to break up the original text by lines though.
Why [r] instead of [ɹ]?
The website provides phonemic transcription. Since there is no rolling [r] sound in English language and therefore no confusion between the two, API recommends using ‘r’ for simplicity. Most dictionaries do just that.