Not that I'm particuarly aware of. However, you only need the administrative install if you are going to slipstream the updates (which, AFIK, means that any subsequent updates have to be installed as administrative updates, and not from the Office Update website).
Personally, I like the ability to use the Office Update website, so I don't do an administrative install by choice. I just install (currently) Office 2003 sp2 & the latest Outlook Junk Mail Filter immediately after the Office install. Probably takes a little bit longer for the actual install, but well worth it in my opinion.
If you follow the guidelines for an unattended install located at MSFN's
Office 2003 Unattended - Advanced Method, you will be able to configure everything you want to (including product key, etc.) for your unattended install.
Here's the code from my CMD file.
CODE
Call :BuildComponent "Installing Office related software"
type %COMPONENT_LOG% >> %XPCD_LOGFILE%
CALL :BuildPackage "Installing Microsoft Office 2003 Professional (Access, Excel, Outlook, Word)" ^
"%AUTOPATH%\Office\Office2003\setup.exe TRANSFORMS=Unattended.MST /qb-"
type %PACKAGE_LOG% >> %XPCD_LOGFILE%
CALL :BuildPackage "Installing Office 2003 Service Pack 2" ^
"%AUTOPATH%\Office\OfficeUpdates\Office2003SP2-KB887616-FullFile-ENU.exe /q"
type %PACKAGE_LOG% >> %XPCD_LOGFILE%
CALL :BuildPackage "Installing Other Office Updates" ^
"%AUTOPATH%\Office\OfficeUpdates\office2003-KB906173-FullFile-ENU.exe /q"
type %PACKAGE_LOG% >> %XPCD_LOGFILE%
CALL :BuildPackage "Installing Microsoft Office Profiles" ^
"*pushd '%ProgramFiles%\Microsoft Office\Office11'" ^
"proflwiz.exe /r D:\Matthew\Computer\Outlook\Matthew.OPS /p"
type %PACKAGE_LOG% >> %XPCD_LOGFILE%