Hi, Just a thought, but would you consider doing a flashcard deck specifically for Katakana words? I was thinking that, as you say on some lessons not every Katakana word is derived from English, it would be a good addition to have this especially for English speakers but also other languages. I know we have Katakana on lesson vocab but this could be a good addition to the Flashcard decks. I think this would help people progress quicker with Katakana.
Thank you for your feedback! I forward it to the Team. For now, this Vocabulary Lists would be helpful for you. "Difficult Katakana Words to Say" http://www.japanesepod101.com/japanese-vocabulary-lists/difficult-katakana-words-to-say