About live wallpaper, I'm sorry but I don't use it. I have no idea why it FCs. Is it happening even after full wipe ?
About message app and sms/mms conversion disabling, yes I think it's CSC related. The only way I know would be is to extract feature.xml from ROM.zip (system\csc), then edit as you want and then push it in system\csc with right permissions. Finally, reboot.
If it doesn't work after reboot, maybe you have to do full wipe to take into account changes.
I've checked a modified feature.xml from other ROM, i can see for instance what follows that could be interesting for you to include in feature.xml :
<!-- Message --> <CscFeature_Message_RecipientLimit>999</CscFeature_Message_RecipientLimit> <CscFeature_Message_SmsToMmsTextThreshold>999</CscFeature_Message_SmsToMmsTextThreshold> <CscFeature_Message_MaxSlideCount>999</CscFeature_Message_MaxSlideCount> <CscFeature_Message_DisableConvertingEffectBetweenSMSMMS>true</CscFeature_Message_DisableConvertingEffectBetweenSMSMMS> <CscFeature_Message_DisableSmsToMmsConversionByTextInput>true</CscFeature_Message_DisableSmsToMmsConversionByTextInput>
But maybe boss @kenar2 could help you more do to this an esaier way.
This is really a mod I need to do. Quite often I send the equivalent to 4 SMSs. Should we wait for his response or try editing the CSC file?