[Windows Phone 7 Development and Hacking] Nokser:
Display Emergency Call Status

[HKEY_LOCAL_MACHINE\System\Phone\Providers\{F0DCA447-4846-4c88-AA2E-C6E33808BE5D}]
"DisplayEmergencyCallStatus"=dword:0
"ExtendedRejectCodes"=dword:0

Execute .cpl file in WP

[HKEY_CLASSES_ROOT\.cpl]
@="cplfile"
[HKEY_CLASSES_ROOT\cplfile]
@=mui_sz:"shellreswpc.dll,#24577"
[HKEY_CLASSES_ROOT\cplfile\DefaultIcon]
@="\\Windows\\shellreswpc.dll,-4608"
[HKEY_CLASSES_ROOT\cplfile\Shell\Open\Command]
@="\\Windows\\ctlpnl.exe %1"

Use MS FileExplorer on Settings

[HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Settings\{c93c54f5-0251-4237-8916-e7331b6c90ca}]
"Title"=mui_sz:"shellreswpc.dll,#41292"
"Type"=dword:0
"Location"="res://Settings3!nyi.uix#Default"
[HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Settings\CanonicalNames]
"Microsoft.FExplorerSettings"="{c93c54f5-0251-4237-8916-e7331b6c90ca}"
[HKEY_CURRENT_USER\Software\Microsoft\Shell\FileExplorer\Settings]
"ShowFileName"=dword:1
"ShowDateModified"=dword:0
"ShowFileSize"=dword:0
"ShowExt"=dword:0
"ViewAll"=dword:0

Support Debug Lib.

[HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\.NETCompactFramework\Installer\Assemblies\Global]
"System.Windows.debug.resources, Version=2.0.5.0, Culture=en-US, PublicKeyToken=7cec85d7bea7798e"=multi_sz:"\\windows\\GAC_System.Windows.debug.resources_v2_0_5_0_cen-US_1.dll","System.Windows.debug.resources.dll"
[HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\.NETCompactFramework\Installer\Assemblies\ROM]
"System.Windows.debug.resources, Version=2.0.5.0, Culture=en-US, PublicKeyToken=7cec85d7bea7798e"=multi_sz:"\\windows\\GAC_System.Windows.debug.resources_v2_0_5_0_cen-US_1.dll","System.Windows.debug.resources.dll"
[HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\.NETCompactFramework\Installer\Assemblies\Global]
"System.Net, Version=2.0.5.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e"=multi_sz:"\\windows\\GAC_System.Net_v2_0_5_0_cneutral_1.dll","System.Net.dll"
[HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\.NETCompactFramework\Installer\Assemblies\ROM]
"System.Net, Version=2.0.5.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e"=multi_sz:"\\windows\\GAC_System.Net_v2_0_5_0_cneutral_1.dll","System.Net.dll"
[HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\.NETCompactFramework\Installer\Assemblies\Global]
"System.Net.debug.resources, Version=2.0.5.0, Culture=en-US, PublicKeyToken=7cec85d7bea7798e"=multi_sz:"\\windows\\GAC_System.Net.debug.resources_v2_0_5_0_cen-US_1.dll","System.Net.debug.resources.dll"
[HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\.NETCompactFramework\Installer\Assemblies\ROM]
"System.Net.debug.resources, Version=2.0.5.0, Culture=en-US, PublicKeyToken=7cec85d7bea7798e"=multi_sz:"\\windows\\GAC_System.Net.debug.resources_v2_0_5_0_cen-US_1.dll","System.Net.debug.resources.dll"

SQM

[HKEY_LOCAL_MACHINE\System\SQM\Engine]
"MaximumSessionSize"=dword:10000 ; Default: 64 KB
"MaximumPacketPoolSize"=dword:20 ; Default: 32
"MaximumFileQueueSize"=dword:64 ; Default: 100; sqmdata%02d.sqm allows sqmdata00 to sqmdata99
"MaximumUploadFolderSize"=dword:100000 ; Default: 1 MB
"PacketProcessorThreadPriority"=dword:FB ; Default: THREAD_PRIORITY_NORMAL (251)
"UploadFolderFilePattern"="_%d.dat"
"PersistentSessionFolder"="\\Windows\\SQM\\Sessions\\"
"StudyID"=dword:0

Edit:

======================================================

Data Speed

[HKEY_LOCAL_MACHINE\Comm\Cellular\DataSpeed]
"UNKNOWN"=dword:23280	; 144000 (bit/sec)
"GPRS"=dword:29BF8	; 171000 (bit/sec)
"EDGE"=dword:5DC00	; 384000 (bit/sec)
"UMTS"=dword:1E8480	; 2000000 (bit/sec)
"HSDPA"=dword:36EE80	; 3600000 (bit/sec)
"LTE"=dword:DBBA00 ; 14400000 (bit/sec)
"1XRTT"=dword:23280	; 144000 (bit/sec)
"1XEVDO"=dword:124F80 ; 1200000 (bit/sec)
"1XEVDV"=dword:249F00 ; 2400000 (bit/sec)

Cellular Settings

[HKEY_LOCAL_MACHINE\Software\Microsoft\Connectivity\CellularCPL]
"CellDataOn"=dword:1
"Roaming"=dword:0
"AutoNetwork"=dword:1
"Show3GToggle"=dword:1
"UpdTimeOut"=dword:15F90
"NetMode"=dword:0
"ShowRoamingList"=dword:1
"ShowAddAPNButton"=dword:1
"ShowNetModeList"=dword:1
"ShowCDMAModeList"=dword:1
"ShowGSMNetList"=dword:2

Edit2:

======================================================

Playback Zune Video

[HKEY_LOCAL_MACHINE\Software\Microsoft\Zune\Playback\Video\A2DP\CapsSet1]
"DisableA2DPPlayback"=dword:1
[HKEY_LOCAL_MACHINE\Software\Microsoft\Zune\Playback\Video\MultiRes\CapsSet1]
"DisableMultiResPlayback"=dword:1
[HKEY_LOCAL_MACHINE\Software\Microsoft\Zune\Playback\Video\MultiRes\CapsSet2]
"DisableMultiResPlayback"=dword:0

SMS Settings

[HKEY_CURRENT_USER\Software\Microsoft\ShortMsg\Settings]
"SMSDeliveryNotify"=dword:0
"CMASAlertOption"=dword:2 ; Default is CMASAlert_Option_AllAlerts
"CMAS_AMBERAlertEnabled"=dword:1 ; Default is enabled
[HKEY_LOCAL_MACHINE\Software\Microsoft\ShortMsg\Settings]
"CmasOperatorEnabled"=dword:0 ; Default is disabled