Did someone forget to add this in FM16, must be an oversight? I can see that the script will not work or be useful if OAuth is not enabled on FMS, but we have plenty of script steps with notes like this. There really is no additional security risk I see for allowing OAuth account management by script. Not having this means a lot of Manual creation or giving clients Full Access for account creation, which is high risk.
I think this should be added ASAP. This makes OAuth a no go for many situations where it would otherwise be an excellent option. I will also have to tell clients that they cannot have it when they really want it unless they deal with an account creation ticket and the accounts are added manually.