This is my method.I already have Grabit setup and running the way I like it, the groups are installed and updated.
I then have a batch file that copies the contents of the Grabit directory (as well as other files) in Program Files to the directory where I store my unattended cd files prior to burning, this is
BootableDVD, the files go in the $Progs directory
CODE
XCOPY "%ProgramFiles%\Grabit" "BootableDVD\$OEM$\$Progs\GrabIt\" /r/s/e/y
REG EXPORT HKCU\Software\Shemes BootableDVD\$OEM$\$1\install\grabit.reg
The last line exports the key with the settings for the program.This will not install a shortcut as one is installed to the quicklaunch bar during Windows setup.When Windows has installed the Grabit directory will have been copied to Program Files and should be updated from the last time you ran it.
I then run the registry key from RunOnceEx (at the end) with the tweaks and other reg files.