I've just added two new settings! 🙂
The first setting lets people choose whether they'd like for tests to default to typing or multiple choice. This setting can be changed on the My Account page:

The second setting lets course authors and contributors mark a course as being designed primarily for multiple choice tests:
Edit: The setting has been moved to a new page. See next post.
Original post:

If you are a course's author or contributor, you can access this setting by opening a course and then clicking "Edit" -> "Edit course info".
If you're currently using a course that you think should have its test type set to "multiple choice", please let me know, so that I can add you as a contributor! 🙂