Possibility to mark every Vocabulary

I don´t know if anyone from the gymglish staff is looking over this comments. It would be desirable. Now my suggestion: There are any passages where the user is enabled to mark several words he/she not knows. This marks are transmitted in a individual vocabulary list. So far so good.
But I find unknown words or idioms in ALL texts. Hence I wish the possibility to mark unknown words in ALL texts of gymglish. Thanks for consideration.