[Touch Pro, Fuze General] Da_G:
While poking around 20954, and comparing it to the stock fuze build 19971 or whatever it is, I noticed that at some point in the 20xxx series there were several registry keys added pertaining to In-Call recording, tried fiddling with them a bit but don't see anything specific kicking in.. maybe someone else wants to tinker!

[HKEY_LOCAL_MACHINE\System\AudioRecording]
"Enabled"=dword:1
[HKEY_CURRENT_USER\Software\Microsoft\Voice]
"AllowInCallRecording"=dword:1
"EnableCallRecordMenuItem"=dword:1

I might be wrong on the HKLM\HKCU parts, try adding them to both.. no idea where the menu option is supposed to show up either, but i'd assume the dialer since it's cprog.exe that checks for these :)

Also, there are new keys in the 20xxx series pertaining to Gestures, which are now supported by WinMo itself, mimicing some of the features available in HTC's TouchFlo (and probably performing better, too, :))

[HKEY_CURRENT_USER\ControlPanel\Gestures\Touch]
"Disabled"=dword:0 ; 0 for disabled, allows multi-select, 1 for enabled, doesn't work so hot with multi-select
"ScrollFriction" ; unknown default value or units
"ScrollInterval" ; unknown default value or units
"Multiplier" ; unknown default value or units
"Length" ; unknown default value or units
"Multiplier" ; unknown default value or units
"Tolerance" ; unknown default value or units
"Timeout" ; unknown default value or units

[HKEY_LOCAL_MACHINE\SYSTEM\GWE\TouchFilter]
"FastestTapTime" ; unknown default value or unit of measure, guess=units in ms
"MaxTapSpan" ; unknown default value or unit of measure, guess=units in pixels
"MaxTouchFilterDelay" ; unknown default value or unit of measure, guess=units in ms

More new stuff:

[HKEY_LOCAL_MACHINE\SYSTEM\GDI\GLYPHCACHE]
"Limit0"=dword:12000 ; unknown, "limit" key controls font cache, limit0 may be a secondary font cache or..?
[HKEY_LOCAL_MACHINE\ControlPanel\Power]
"DynamicChargeicon"=dword:1 ; set to 0 for normal "plugged in" icon when on ac/usb power, set to 1 for blinking battery icon to indicate charging
[HKEY_CURRENT_USER\ControlPanel\Phone]
"EnableTextResponse"=dword:1 ; unknown
"DisableGSMNetworkSelection"=dword:0 ; unknown, but you can guess from its name
[HKEY_LOCAL_MACHINE\Software\Microsoft\SIClnt]
"ShowAllSIPopups"=dword:1 ; imagine this has something to do with SI/SL messages from provider, see http://msdn.microsoft.com/en-us/library/ms890494.aspx
"HideMediumSIPopups"=dword:0 ; see above
[HKEY_LOCAL_MACHINE\System\Inbox\Settings]
"ShowReplySMSSK1"=dword:1 ; unknown
"MsgClassMenuOrder" ; unknown default or units of mesaure
[HKEY_LOCAL_MACHINE\System\Inbox\Settings\OEM]
"CustomEventHandler" ; unknown
[HKEY_LOCAL_MACHINE\Software\Microsoft\Inbox\Settings]
"ReminderAllDay"=dword:1 ; unknown
[HKEY_LOCAL_MACHINE\System\Inbox\AutoConfiguration]
"DefaultDestinationNetworkGUID" ; unknown, probably directs sms/mms/email to use a specific connection (i.e. wap.cingular vs. ims.cingular vs. isp.cingular) - value is most likely a string that matches the connection GUID
[HKEY_CURRENT_USER\Software\Microsoft\Inbox]
"DisableAutoSSL"=dword:0 ; unknown
[HKEY_LOCAL_MACHINE\Software\Microsoft\Pim\Contacts]
"SIMNewContact" ; unknown
[HKEY_LOCAL_MACHINE\Comm\Tcpip\Parms]
"TcpRttVarAdjustment" ; unknown, probably a dynamic RTT prediction
"TcpSmoothRttAdjustment" ; see above, probably toggle dword 0/1

If a value doesn't work, try swapping HKCU for HKLM and vice versa, I jotted these down as I was going along looking for other things, and left that part off o.O

New sound category:

[HKEY_CURRENT_USER\ControlPanel\Sounds\CallStart]

IE Mobile 6:

[HKEY_LOCAL_MACHINE\Security\Internet Explorer]
"MSHTML"=dword:0 ; 0 for old IE, 1 for IE Mobile 6
[HKEY_CURRENT_USER\Software\Microsoft\Internet Explorer\Settings]
"Always Use My Font Size"=dword:1 ; overrides absolute font sizes on webpages, uses menu setting for font sizes

Prototype UI? Removes the start button and x button..

[HKEY_LOCAL_MACHINE\Adaptation]
"PROTOTYPE"=dword:1