Hi,
It doesn’t look like there is any (currently exposed) way to toggle that setting on the existing delegate we use on Presubmit, though we could probably add a setting to UDataValidationSettings to control this. For now, you could subclass UEditorValidatorSubsystem to replace it with your own delegate. You should just need to override Initialize and change the call to RegisterPreSubmitDataValidation to point to your own delegate which passes in the desired settings. If a subclass exists, we’ll automatically prevent the data validation subsystem from initializing so that your subclass can handle it (see UEditorValidatorSubsystem::ShouldCreateSubsystem).
Alternatively, if you’d prefer to just add a setting to UDataValidationSettings and use it to drive that parameter in the existing delegate, feel free to send in a pull request and I can see if the team will integrate it.
Best,
Cody