Junction Directories, prior to File Copy

[Crash&Burn]

Is it possible to junction the "Documents & Settings" and "Program Files" directories before the install creates the folders?

I know I can prep the drive from my current WindowsOS, but would like to know if its possible unattended, and how. Junction itself might not even be possible unless an older version - the current SysInternal tools popUp a EULA during first run.

Minimally, would need to copy junction.exe to System32, placed into an $OEM$ folder should work in that case. So is it possible to call a JncRoot.cmd after the Install creates C:\WINNT and before it creates C:\Program Files, etc. ??