Let's start with simple and complicated part at the same time.
We would need to generate SEB config XML from moodle form (quiz setting form).
It should be a new section "Require the use of Safe Exam Browser" - yes/no
If yes, the a list of all available options are displayed see mock-ups in https://tracker.moodle.org/browse/MDL-64934
Once saved it should generate SEB config file that will be used for SEB integration.