Unable to get Autologin override to work properly on Windows 7 Pro 64

in our current environment we have about 150 PC's setup to autologin as a restricted account. They are basically kiosks, with very limited access to everything (no proxy, no network drives, no cmd prompt, no right click etc). I want to upgrade them all to windows 7 64, and am struggling with autologin.

autologin from systinternals does not work on 64 bit because it modifies the 32bit subsection of the registry file here:
HKLM\SOFTWARE\Wow6432Node\Microsoft\Windows NT\Current Config\WinLogon

I have succesfully made a machine autologin, but when I hold shift, it will not override. I need to be able to log into these machines as administrator in order to support them.

the keys that I have been changing:

HKLM\SOFTWARE\Microsoft\Windows NT\Current Config\WinLogon
AutoAdminlogon 1
DefaultDomainName *****
DefaultUserName ******
DefaultPassword ******
ForceAutoLogon 1

If i set ForceAutoLogon to 0 it will automatically log in at bootup. If a user selects logoff then it will go to a login screen. I want it to Autologin when a user selects Logoff, unless shift is held.

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