At the moment in the Workbench settings under Tools > FME Options it IS possible to reset the settings on one page, for example on the 'Translation' tab. But if you want to reset all settings back to factory default you have to do every page, one at a time.
Please can we have a 'Reset All' button that will clear back all system settings. Or force you to a selection dialog box where you can tick off which settings to revert.
This would be especially useful for test deployments, training machines and debugging.
It is the opposite of being able to export all settings and share them with a colleague or another machine, but no less important than @takashi's suggestion here https://knowledge.safe.com/content/idea/84078/backuprestore-fme-options-configuration.html .