[Windows Mobile] twopumpchump:
it doesnt hurt anything to delete the rgu/dsm/package.ini files from the ext pkgs. here is what i do to delete all of them plus delete all other resolution cprs besides wvga from my SYS.

open kitchen_build_rom.bat, and copy/paste the part in red to it in the correct place.

set DSM_TEMPLATE=%dsm%
set DSM_INCLUDES=*
[COLOR="Red"]echo.removing unwanted files from EXT...
echo.
echo.Please wait...
del EXT\package.ini /s
del EXT\*.dsm /s
del EXT\*.rgu /s
echo.
echo Done!!!
echo.removing unwanted cpr files from SYS...
echo.
echo.Please wait...
attrib +A -S -H -R SYS\*.cpr /s
del SYS\LS_AlarmScene_240x320.cpr /s
del SYS\LS_AlarmScene_240x400.cpr /s
del SYS\LS_AlarmScene_320x240.cpr /s
del SYS\LS_AlarmScene_320x320.cpr /s
del SYS\LS_AlarmScene_400x240.cpr /s
del SYS\LS_AlarmScene_480x480.cpr /s
del SYS\LS_AlarmScene_480x640.cpr /s
del SYS\LS_AlarmScene_480x854.cpr /s
del SYS\LS_AlarmScene_640x480.cpr /s
del SYS\LS_AlarmScene_854x480.cpr /s
del SYS\LS_Global_240x320.cpr /s
del SYS\LS_Global_240x400.cpr /s
del SYS\LS_Global_320x240.cpr /s
del SYS\LS_Global_320x320.cpr /s
del SYS\LS_Global_400x240.cpr /s
del SYS\LS_Global_480x480.cpr /s
del SYS\LS_Global_480x640.cpr /s
del SYS\LS_Global_480x854.cpr /s
del SYS\LS_Global_640x480.cpr /s
del SYS\LS_Global_854x480.cpr /s
del SYS\LS_LockScene_240x320.cpr /s
del SYS\LS_LockScene_240x400.cpr /s
del SYS\LS_LockScene_320x240.cpr /s
del SYS\LS_LockScene_320x320.cpr /s
del SYS\LS_LockScene_400x240.cpr /s
del SYS\LS_LockScene_480x480.cpr /s
del SYS\LS_LockScene_480x640.cpr /s
del SYS\LS_LockScene_480x854.cpr /s
del SYS\LS_LockScene_640x480.cpr /s
del SYS\LS_LockScene_854x480.cpr /s
del SYS\LS_PhoneAlertScene_240x320.cpr /s
del SYS\LS_PhoneAlertScene_240x400.cpr /s
del SYS\LS_PhoneAlertScene_320x240.cpr /s
del SYS\LS_PhoneAlertScene_320x320.cpr /s
del SYS\LS_PhoneAlertScene_400x240.cpr /s
del SYS\LS_PhoneAlertScene_480x480.cpr /s
del SYS\LS_PhoneAlertScene_480x640.cpr /s
del SYS\LS_PhoneAlertScene_480x854.cpr /s
del SYS\LS_PhoneAlertScene_640x480.cpr /s
del SYS\LS_PhoneAlertScene_854x480.cpr /s
del SYS\LS_PhoneCallScene_240x320.cpr /s
del SYS\LS_PhoneCallScene_240x400.cpr /s
del SYS\LS_PhoneCallScene_320x240.cpr /s
del SYS\LS_PhoneCallScene_320x320.cpr /s
del SYS\LS_PhoneCallScene_400x240.cpr /s
del SYS\LS_PhoneCallScene_480x480.cpr /s
del SYS\LS_PhoneCallScene_480x640.cpr /s
del SYS\LS_PhoneCallScene_480x854.cpr /s
del SYS\LS_PhoneCallScene_640x480.cpr /s
del SYS\LS_PhoneCallScene_854x480.cpr /s
del SYS\LS_SimplePinScene_240x320.cpr /s
del SYS\LS_SimplePinScene_240x400.cpr /s
del SYS\LS_SimplePinScene_320x240.cpr /s
del SYS\LS_SimplePinScene_320x320.cpr /s
del SYS\LS_SimplePinScene_400x240.cpr /s
del SYS\LS_SimplePinScene_480x480.cpr /s
del SYS\LS_SimplePinScene_480x640.cpr /s
del SYS\LS_SimplePinScene_480x854.cpr /s
del SYS\LS_SimplePinScene_640x480.cpr /s
del SYS\LS_SimplePinScene_854x480.cpr /s
del SYS\SlidingPanel_240x320.cpr /s
del SYS\SlidingPanel_240x320_0411.cpr /s
del SYS\SlidingPanel_320x240.cpr /s
del SYS\SlidingPanel_320x320.cpr /s
del SYS\Titanium_240x320.cpr /s
del SYS\Titanium_240x400.cpr /s
del SYS\Titanium_320x240.cpr /s
del SYS\Titanium_320x320.cpr /s
del SYS\Titanium_400x240.cpr /s
del SYS\Titanium_480x480.cpr /s
del SYS\Titanium_480x640.cpr /s
del SYS\Titanium_480x854.cpr /s
del SYS\Titanium_640x480.cpr /s
del SYS\Titanium_854x480.cpr /s
echo.
echo Done!!![/COLOR]

TOOLS\platformrebuilder.exe
if not "%errorlevel%"=="0" goto error

if you are cooking for another resolution besides wvga, just change your resolution cpr values with 480x800/800x480 in notepad :)