Err... uhm..... you're right - something's wrong with Android and Sony Settings....
I replaced Settings.* and EbookSetting.* with the ones in your packages and now they seem to work fine...
But surely you will now suggest to flash the whole minimal rupor package I guess
I won't disagree....
Regarding launcher - I have ADW Launcher.
Edit: also Ebook Reading app needs to be updated as page settings are not available otherwise...
I flashed the complete rupor minimal package now, with only slight modifications (left out framework-res.apk in order to keep white on black theme)