Editable "Categories"
I am using ReadLang more and more, and I am finding it to be extremely useful and helpful. One part that could be more useful is "Categories' for Texts. Currently the categories are fiction, non-fiction, song, conversation and other. Those don't seem to be applicable to me (except Conversation), but may be to others. It would be useful to me to be able to edit (make) my own Categories. The obvious ones that come to mind are: Phrases, Grammar, Expressions, Connectors, Science, News, Lessons, Study.
Somewhat related: As I become more and more proficient in my target language, I am using ReadLang in a slightly different way. Most of what I am clicking on and adding to the word lists are not individual words but two-word pairs, phrases and short sentences. Learning these expressions rather than learning isolated words is really improving my active vocabulary to be more native-like in my writing and speaking. To that end, it would be useful to be able to toggle a switch in Flashcards to review only entries of two words or more, and not review individual words. Likewise, under "Perform action", it would be useful to have "Export phrases" in addition to "Export".