The only thing I've managed to pull from the threads talking about it is this:
CODE
[Keyboard]
HKLM,"%RunOnceEx%\install017",1,,"%11%\msiexec.exe /i %01%\install\Intellipoint\Keyboard\ITP50.msi kb=1006 /QR"
[Mouse]
HKLM,"%RunOnceEx%\install017",2,,"%11%\msiexec.exe /i %01%\install\Intellipoint\Mouse\IP50.msi mm=10 /QR REBOOT=ReallySuppress"
Where the mm=would be the code of your mouse, and the kb= would be the model of your keyboard. I looked in the registry and mine are 10 and 1006 respectively.
I have no idea how to apply this and put it in my runonceex.cmd though so would appreciate it if someone could explain it.