A big omission from current Quiz API endpoints is the ability to modify Question Banks. (I know Quizzes.Next is changing the structure of Banks, and this may be addressed.)
There is currently an Object key for assessment_question_bank_id and having either an API endpoint or adding an optional key on the QuizQuestion item for modifications would make large-scale bank edits much easier.
For example, my district's ExamView software is so old, we cannot export a proper QTI file for bank imports. As a workaround, teachers have created shared Google Sheets with questions and answers in a standard format. With an API endpoint, it would be a simple loop to write thousands of questions quickly.