You can't "add" these features back to the Windows Installation files.
Those once you've installed Windows, open the start menu and type "region and language".
From there you can change your local, keyboard setup etc.
in short, you can't unles you customized a copy of Windows 7 with vLite if it's your OEM disk than you can only change the options from within windows, as i mentioned earlier.
But if you have a vLite-d copy, you can copy the files to your HDD then delete Autounattend and burn them back to a bootable DVD