If you're cooking your own ROM you can turn the sync on by default through the registry as well.
Code:
[HKEY_LOCAL_MACHINE\Drivers\BuiltIn\RIL]
"NITZEnable"=dword:00000001
[HKEY_CURRENT_USER\CONTROLPANEL\PHONEEXTENDFUNCTION\CDMA]
"SyncSystemTime"=dword:00000001