Amazing! I never heard of the Feedback activity before. For some reason it is disabled on my Moodle server.
If you want to write lots of questions outside the Moodle Question Bank, you could consider using my WordTable plugin, which lets you write the questions in Microsoft Word and import them in batches. You can also set the grade values for all answers to 100% in Multiple Choice Questions, which would save you having to edit them inside Moodle.