Brent Ozar notes something nice in the SQL Server 2019 CTP 3.0 setup:
Just a short note – in SQL Server 2019, the setup process has a new MAXDOP tab:
It’s right next to the TempDB tab. I like this idea a lot, as MAXDOP is one of those things you always change right after installation, so letting us change it before install makes it easier to remember and we can include it in the setup script.