Vista - Add to DevicePath Data in registry

I'm using VS2008 (VB) with Windows Installer setup project.

My application requires our supplied, unsigned, pnp USB drivers to be
installed. I would like to handel as much of the driver preparation as
possible.

If I understand correctly,
HKEY_LOCAL_MACHINE\Software\Microsoft\Windows\CurrentVersion: DevicePath
holds a lookup table that Windows uses to search for the best drivers when
the device is first connected. Is there a simple way to add our drivers path
to this list during the software installation process?

Thanks for your help,
Chris