The newest version of Symantec Ghost 12.X supports UEFI / GPT finally! We've been worried about this as we start to move more and more to 64 bit and UEFI.
You must get the entire Solution Suite v3 and install if somewhere, then get the Ghost32.exe. Ghost64.exe etc. files out of the created boot media's WIM file. There is probably an easier way to do it but this was it for me. We never have used the Ghostcast server, we just write to network shares or attahed USB drives.
I've simply taken my tried and true ghost script and plunked the new Ghost files in it as attachments and it works fine.