NikLok, да вроде не плюёт ни на что. Думаю настройки FSA преобладают над параметрами sif, т.к. FSA патчит файлы. Этот аддон не трогает fSetup.ini.
У меня описанных Вами проблем нет.
Вот мой sif до (полностью тихая установка):
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Код:

[Data]
AutomaticUpdates=1
Autopartition=0
EulaComplete=1
MsDosInitiated=0
UnattendedInstall=1
[Unattended]
AutoActivate=No
DriverSigningPolicy=Ignore
FileSystem=*
Hibernation=Yes
NonDriverSigningPolicy=Ignore
OemSkipEula=Yes
Repartition=No
TargetPath=\Windows
UnattendMode=FullUnattended
WaitForReboot=No
[GuiUnattended]
AdminPassword="*"
AutoLogon=No
EncryptedAdminPassword=No
OEMSkipRegional=1
TimeZone=125
[UserData]
ComputerName=*
ProductKey=xxxxxxxxxxxxxxxxxxxxxxx
FullName=User
OrgName=
[Display]
BitsPerPel=32
Vrefresh=60
[TapiLocation]
CountryCode=7
Dialing=Tone
[RegionalSettings]
SystemLocale=00000419
UserLocale=00000419
UserLocale_DefaultUser=00000419
InputLocale=0409:00000409,0419:00000419
LanguageGroup=1,2,3,4,5
[Identification]
JoinWorkgroup=
[Networking]
InstallDefaultComponents=Yes
[WindowsFirewall]
Profiles=WindowsFirewall.TurnOffFirewall
[WindowsFirewall.TurnOffFirewall]
Mode=0
[IEPopupBlocker]
AllowedSites=www.oszone.net;www.microsoft.com
BlockPopups=Yes
FilterLevel=Medium
ShowInformationBar=Yes
[Branding]
BrandIEUsingUnattended=Yes
[Proxy]
Proxy_Enable=0
HTTP_Proxy_Server=:
Use_Same_Proxy=1
Proxy_Override=
[Shell]
DefaultStartPanelOff=No
DefaultThemesOff=No
CustomDefaultThemeFile="%Systemroot%\Resources\Themes\BlackBlue.Theme"
[url]
Home_Page=http://www.google.ru
Help_Page=http://www.google.ru
Search_Page=http://www.google.ru
[Uninstall]
DisableCompression=Yes
EnableBackup=No
PathForBackup="%SYSTEMDRIVE%\Backup"
[SystemRestore]
DisableSR=0
CreateFirstRunRp=1
[Components]
AccessOpt=off
cdplayer=off
deskpaper=off
fp_extensions=off
IEHardenUser=off
indexsrv_system=off
inetprint=off
media_clips=off
mousepoint=off
msmsgs=off
msnexplr=off
mswordpad=off
OEAccess=off
rstorage=off
templates=off
TSWebClient=off
tourstart=off
WMAccess=off
zonegames=off
[NetProtocols]
#MS_TCPIP=
Вот после(без изменений, просто на выходе программы):
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Код:

[Data]
AutomaticUpdates=1
Autopartition=0
EulaComplete=1
MsDosInitiated=0
UnattendedInstall=1
[Unattended]
AutoActivate=No
DriverSigningPolicy=Ignore
FileSystem=*
Hibernation=Yes
NonDriverSigningPolicy=Ignore
OemSkipEula=Yes
Repartition=No
TargetPath=\Windows
UnattendMode=FullUnattended
WaitForReboot=No
Unattendswitch=Yes
OemPreinstall=No
[GuiUnattended]
AdminPassword=*
OEMSkipRegional=1
TimeZone=125
OEMSkipWelcome=1
[UserData]
ComputerName=*
ProductKey=ххххххххххххххххххххххххххххххх
FullName="User"
OrgName="Home"
[Display]
BitsPerPel=32
Vrefresh=60
Xresolution=800
Yresolution=600
[TapiLocation]
CountryCode=7
Dialing=Tone
[RegionalSettings]
SystemLocale=00000419
UserLocale=00000419
UserLocale_DefaultUser=00000419
InputLocale="0409:00000409,"419:00000419"
LanguageGroup=
InputLocale_DefaultUser="0409:00000409,"419:00000419"
[Identification]
JoinWorkgroup=WORKGROUP
[Networking]
InstallDefaultComponents=Yes
[WindowsFirewall]
Profiles=WindowsFirewall.TurnOffFirewall
[WindowsFirewall.TurnOffFirewall]
Mode=0
[IEPopupBlocker]
AllowedSites=www.oszone.net;www.microsoft.com
BlockPopups=Yes
FilterLevel=Medium
ShowInformationBar=Yes
[Shell]
DefaultStartPanelOff=No
DefaultThemesOff=No
CustomDefaultThemeFile="%Systemroot%\Resources\Themes\BlackBlue.Theme"
[url]
Home_Page=http://www.google.ru
Help_Page=http://www.google.ru
Search_Page=http://www.google.ru
[Uninstall]
DisableCompression=Yes
EnableBackup=No
PathForBackup="%SYSTEMDRIVE%\Backup"
[SystemRestore]
DisableSR=0
CreateFirstRunRp=1
CheckpointCalendarFrequency=5
RestorePointLife=30
MaximumDataStorePercentOfDisk=12
[SetupParams]
UserExecute="%Systemdrive%\NewUser.cmd"
[Branding]
BrandIEUsingUnattended=Yes
[Components]
AccessOpt=off
cdplayer=off
deskpaper=off
fp_extensions=off
IEHardenUser=off
indexsrv_system=off
inetprint=off
media_clips=off
mousepoint=off
msmsgs=off
msnexplr=off
mswordpad=off
OEAccess=off
rstorage=off
templates=off
tourstart=off
TSWebClient=off
WMAccess=off
zonegames=off
Все настройки остались как было изначально указано.
Может у Вас
Unattendswitch=Yes выключен?