Hi Stephen,
Questions about how the support would work are likely to be best answered through contract channels like SAP Contract Department / SAP Account Executive. I just wrote you what is available in one of the SAP Notes I have referred to. I am not entitled to define what is supported or what is not, therefore, Contract department or Account Executive would be best channels to provide such answers.
And I really think that discuss over the point of SAP NetWeaver and the SQL development will not advance. I think at this point, if you are interested in finding the differences, to go through the SQL Server licensing terms for SQL Developer edition and what is SAP NetWeaver (which is really different than developing something on Visual Studio, etc).
Best Regards,
Luis