Moodle™ is a registered trademark.
Site policy | Contact
Actually, it is easier to do this for all types of plugin, not just qtypes.
This should save 32 config variables, or 9% of the size of the config table.
Patch for review
I tested both a fresh install, and also, upgrading from yesterday's head while simultaneously upgrading one core question type plugin and installing a contrib question type. Both worked.