The easiest way to import registry entries (other than those directly supported by nLite) into your windows installation is to NOT do it in nLite, but to add them to your
$OEM$ folder after you have run nLite, but before you finalize and make an ISO.
In the $OEM$ folder (situated just above
I386 in the windows installation folder) you will find
cmdlines.txt, which looks something like this when you open it:
CODE
[Commands]
"rundll32 advpack.dll,LaunchINFSection nLite.inf,U"
Below those you add this line:
CODE
"REGEDT32.EXE /S tweaks.reg"
...where tweaks.reg is the name of your reg file. Then put tweaks.reg (or whatever name you want to use) in the $OEM$ folder. You can have several reg files also, just put a new line for each file.
Highly recommended reading:
http://unattended.msfn.org/unattended.xp/view/web/14/