Just a couple of quick PowerShell commands that can be used to create a Server 2012 R2 custom Start Screen.
Set up the Start Screen as required and then run this:
- Export-StartLayout -As BIN -Path C:\Temp\CustomStartScreenLayout.bin
Use this to import.
- Import-StartLayout -LayoutPath C:\Temp\CustomStartScreenLayout -MountPath c:\
The import line can be used in a script as part of an SCCM/MDT Task Sequence.