This request is related to 
my (false) "Bugs item #1038410"
since it is by design and it won't be fixed
I thought I could be suggested as a new feature.

Request:
Add a command line switch to be able to specify
python install directory in silent installation mode

in other word it should be something like this:

Python-X.Y.Z.exe /s /d MAINDIR=C:\some_dir\python


BTW:
IIRC the windows wise installer configuration file is not 
provided into python cvs source tree so I can only
suggest this google-groups thread as a hint:

Newsgroups:wise.wise7.general
Subject: "Passing the path name to a silent install. How?"
Data:2000/01/17

Logged In: YES 
user_id=1326842

Starting with Python 2.4 it is possible to specify 
a TARGETDIR parameter to the msi installer.
See http://www.python.org/download/releases/2.4/msi/
for more details.

This feature request should be closed as fixed.