The base path to Windows registry settings for SageTV is:
HKLM\Software\Frey Technologies\

For Windows Vista 64 and Windows 7 64, the base path is:
HKLM\Software\Wow6432Node\Frey Technologies\

On Windows Vista and Windows 7, if UAC is enabled the registry keys may also be under:
HKEY_USERS\<user id token>\Software\Classes\VirtualStore\MACHINE\SOFTWARE\Frey Technologies\
HKEY_USERS\<user id token>\Software\Classes\VirtualStore\MACHINE\SOFTWARE\Wow6432Node\Frey Technologies\

Adjust the registry paths below as needed.
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HKLM\Software\Frey Technologies\Common\

Enable the DOS Console Window (default is 0)
DWORD
consolewin=1


HKLM\Software\Frey Technologies\Common\DirectShow\

Specify a custom demux filter by the filter's GUID
REGSZ
CustomDemuxGuid={xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx}

Specifies the scale factor for bitrate when SD content is detected on the HDPVR input. The value is divided by 10 before being applied; the default is 25 which scales down by a factor of 2.5.
DWORD
SDCapRateDiv10=25

Enable use of the new Stream Demux DShow filter if set to 1 (default); set to 0 to disable
New for Version: 7.0
DWORD
EnableSageTVStreamDemux=1

If set then SageTVClient will try to playback files from the server by using local filesystem paths if they exist instead of streaming from the server. default is 1
DWORD
EnableStandardFilePlayback=1


HKLM\Software\Frey Technologies\Common\DSFilters\MpegDeMux\

Cause DolbyTrueHD and DTS-HD/MA to be output as AC3 or DTS respectively (the core streams). Set to 1 to enable HD audio output instead.
Can be changed via the UI option at Detailed Setup > Video / Audio > HD Audio Output 
New for Version: 7.0
DWORD
EnableHDAudio=0


HKLM\Software\Frey Technologies\Common\DSFilters\MpegEnc\

Controls field ordering when using software encoding; defaults to 1
DWORD
TopFieldFirst=1


HKLM\Software\Frey Technologies\Common\DSFilters\MpegMux\

Enables optimizations that help with network encoding file transfers by using much larger packet sizes (off by default, 1 enables it)
DWORD
OptimizeNetTransfers=1


HKLM\Software\Frey Technologies\Common\DSFilters\AudioDec\

Switches to using AC3Filter for the audio decoder even if the SageTV Audio Decoder is selected (on by default)
DWORD
AlwaysSwapForAC3Filter=1


HKLM\Software\Frey Technologies\Common\DSFilters\MusicVisFilter\

Adjusts the speed the colors change for the default music visualization (default is 1)
DWORD
ColorVelocity=1

Adjusts the speed the position changes for the default music visualization (default is 1)
DWORD
Velocity=1


HKLM\Software\Frey Technologies\SageTV\

Tell SageTV to not consume the Power event from an MCE remote and let the OS handle it instead if set to 1 (default); set to 0 to disable.
New for Version: 7.0
DWORD
IgnoreMCEPowerOff=1 

Specifies the maximum heap size to use for the JVM in megabytes. If it's zero then SageTV will use its default.
DWORD
JVMMaxHeapSizeMB=0 

Specifies the baud rate to use for the DirecTV Serial connection (not set by default, which causes autodetection)
DWORD
DirecTVSerialBaudRate=9600

Specifies which command set (old or new) to use for the DirecTV serial connection. 0 is old, 1 is new (not set by default, which causes autodetection)
DWORD
DirecTVCmdSet=0

Bitmask for modifying how DirecTV serial commands are sent. 0x1 uses fast channel changes (it doesn't send each individual key); 0x2 ignores replies from the receiver; 0x4 disables sending of the extra 0xd byte at the end of the command (default is unset, which disables all these features)
DWORD
DirecTVSerialFastChannelChanges


HKLM\SOFTWARE\Frey Technologies\SageTV\DirectX9\

Specified how many frames late an EVR sample can be without being dropped; default is 2
DWORD
EVRFrameDropThreshold=2

Specifies the number of input pins on the EVR filter. Default is unset which corresponds to 1 on XP and 3 on Vista or higher.
DWORD
EVRInputPins=3

Specifies the number of frame buffers that EVR should use for display (default is 2)
DWORD
EVRBufferCount=2

If set to 1, then the hint for using the 0-255 color range instead of 16-235 will be used when configuring the EVR (Default is 0)
DWORD
EVR0To255Range=0

Specifies if VMR9 should add additional input pins to enable CC and subpicture display, default is 1 (which means use extra pins)
DWORD
AllowCCForVMR9=1

Enables YUVMixing mode for VMR9 (default is on)
DWORD
YUVMixing=1