Doesn't seem like a parameter for Automatic (Delayed Start) is supported so I ended up simply calling a .bat file after the service is installed. It sets the appropriate key/value in the Windows registry to mark a service as delayed-start.
reg add "HKLM\SYSTEM\CurrentControlSet\services\%1" /v DelayedAutostart /t REG_DWORD /d 0x1 /f"
Just run the batch file, passing an argument for the service name.
automaticDelayedStart.bat MyService