Hi! Thanks so much for the review, I am glad that it is useful. <3 Custom list of replacements is a very interesting idea. One downside is that any custom replacement of Math notation would break Smart Translations in the Khan Translation Editor. So in general it is better to implement it directly. Would you mind elaborating on what replacement you are missing? You can either open an issue in the Github repository https://github.com/Khan/KhanAcademyDots/issues/new/choose, or just shoot me an email at danekhollas@gmail.com. Thanks!