1) Comment out the 2 lines in every plugin
2) In the !custom directory create a plugin file that contains ( normally this will be the first processed plugin ):
[Version]
Signature= "$Windows NT$"
[PEBuilder]
Name="Fake nu2menu"
Enable=1
[SourceDisksFiles]
nu2menu.xml=2
In the same directory create an empty nu2menu.xml file. When you build your cd you will finish up with an nu2menu.xml in the system32 directory. You can choose to ignore this file or if you are using something like the Sherpya build scripts then you can add a command to the wrapper.cmd to delete this file prior to building the iso.