I've updated the script to highlight the vocab word in the context sentence. The default is off, so if you want to try it, set highlightword (in line 15) to 1.
If I could ask for one additional feature (change-able in script text would be fine) it would be to only show the context sentence after
getting the correct answer. As of now it appears to display the sentence before you have made an answer?
I know many prefer to learn words in context like this, but as I do a lot of reading I kind of like to keep WaniKani "pure" in that sense - I would probably use Anki decks for contextual learning. So although there are a lot of things I know I would get right in context, yet can't recall in isolation - that suits me just fine!