Here is some info on the new extended ROM, I forgot where I found this. So don't credit me for this....

Apache_VZW_MMX3.0.6_24.20060124.CAB
Installs ArcMMS and configures for Verizon
(Adds MMS Functionality)

Customize_105201.sa.CAB
Customizes various settings:
Sets Verizon Logo
Adds various help files
Sets up IE Default homepage

Sets Number for Voicemail
[HKEY_CURRENT_USER\Software\Microsoft\Vmail]
"UserProvidedNumber1"="*86"

Sets Multi-NAI (Detection of Tethering, by using a different NAI)
[HKEY_LOCAL_MACHINE\SOFTWARE\OEM\WModem]
"Multi-NAI"=dword:00000001

Sets SMS Priorities
[HKEY_LOCAL_MACHINE\Software\OEM\SMS]
"EnablePriorityHighLevel"=dword:00000001
"PriorityHighLevel"=dword:00000001

Enable_RingTone.sa.CAB
Sets up MIDI Ring tones

Link.sa.CAB
Sets up various application links in the Programs directory

PP_AddRingTone_Apache_205200.sa.CAB
Adds custom ringtones (Ring1, Ring2, Ring3, etc).

PP_AreaCode_Apache_203700.sa.CAB
Adds default "Area Code" option to address book for reasons unknown

PP_DataRetry_Apache_205200.sa.CAB
Sets up connection manager retry settings

PP_Download_Apache_203200.sa.CAB
Sets up "Download" link (useless subsidy marketing crap)

PP_MSFP_Apache_205200.sa.CAB
Sets up Sync Heartbeats (?)

PP_NoLog_Apache_203200.sa.CAB
Sets NoLog option in HTLM\Software\Apps\CabName (?)

PP_SMSACK_Apache_203200.sa.CAB
Sets Delivery Ack on SMS Messages

PP_Version_Apache_207200.sa.CAB
Sets Version in HTLM\Software\OEM\3rdversion MSYSTEM 2.07.200 WWE

PT_BT_Apache_205200.sa.CAB
Appears to set BT Modem strings
Does not appear to be necessary for data operation

PT_HideModeOfOperation_Apache_203200.sa.CAB
Hides the "Mode of Operation" page in Phone settings / options screen

PT_PhoneSettingHelpFile_Apache_205200.sa.CAB
Adds help files

PT_WifiAndRadio_Apache_203200.sa.CAB
Sets MutexFlag to 0, allowing for Phone and Wifi to be used simultaneously
NOTE: Older versions of the Verizon customizations _disable_ this feature.
The default in the latest ROM appears to be enabled for use.

Region.sa.CAB
Sets up Time/Date region in clock

Remove.sa.CAB
Deletes the Add/Remove options for Verizon Customizations

VZWProvision_Signed.sa
Installs Verizon-Signed Certificates, presumably for application installs

VZWProvision.PPC400_2577MTM.CAB
Appears to install custom version of Wireless Sync.
The more generic cab can be installed at http://ota.wsync.com/
NOTE: Wireless Sync is Verizon's sync service, NOT ActiveSync.
You don't need this to run ActiveSync over Bluetooth or WiFi.