SetupPsychtoolbox can but remove old Psychtoolbox completely

MATLAB Version 7.2.0.232 (R2006a)
Operating System: Microsoft Windows XP Version 5.1
(Build 2600: Service Pack 2)
Java VM Version: Java 1.5.0 with Sun Microsystems Inc.
Java HotSpot(TM) Client VM mixed mode
svn, version 1.5.0 (r31699) compiled Jun 19 2008, 11:40:05
Psychtoolbox Version 3.0.8 9 October

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My old PsychtoolboxRoot was
C:\Program Files\osxptb\PsychtoolboxOS9-2.56
I used subversion to downloaded the lastest Psychtoolbox in
C:\Program Files\osxptb\beta\Psychtoolbox
and ran SetupPsychtoolbox.
Then when I used "Set Path" dialog to see the path,
the pathes of PTB2 were still in my MATLAB path.

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I guess the problem is when SetupPsychtoolbox executed,
It just remove the pathes with a folder exact named 'Psychtoolbox'.
So I suggest SetupPsychtoolbox can also remove the pathes
whose prefix equal to PsychtoolboxRoot
when SetupPsychtoolbox want to remove old Psychtoolboxes.