General :: How To Properly Edit System APK

I have both a Galaxy Tab from Verizon and Sprint with stock roms. I want to take the Settings.Apk and just modify out the Wireless AP launcher activity from AndroidManifest.xml..So I decompile the APK, remove the offending XML section and recompile. Sign it and get this

Code:
I/PackageManager( 120): /system/app/Settings.apk changed; collecting certs
W/PackageManager( 120): Signature mismatch for shared user : SharedUserSetting{40554d08 android.uid.system/1000}
E/PackageManager( 120): Package com.android.settings has no signatures that match those in shared user android.uid.system; ignoring!
Maybe I did the signing wrong. Okay, so I take the Settings.Apk from AOSP Gingerbreak (from the SDK Emulator) and plug it in.

I try an unsigned apk and I get another issue about not being signed. I research and I read that I have to resign all APKs... So I do. I take all /system/ app/ *.apk with the matching certificate and resign them. I also take /system/framework/framework-res.apk and /system/framework/twframework-res.apk

Code:
W/PackageManager( 120): Library not found: /system/framework/sec_feature.jar
D/PackageManager( 120): Scanning app dir /system/framework
D/PackageManager( 120): This is not system dir
[code]....