btw the carhome update is still incompatible in market but doesn't really matter cause it's the only one i noticed
could you have a look at that apk?
maybe you can find out the reason why booting with sdcard doesn't work...
but be careful unrooting messes up system, wifi etc
btw i looked in some files located in /d/mmc0/mmc1 they have all the same content about can't open file or something like that maybe helpful... don't know
and still another thing could you also have a look at the usb stuff maybe it's also rom related that mass storage in android isn't working because it works every time on first boot after installation but never afterwards...
therefore i also noticed that android sometimes doesn't detect right if it's charged by usb or ac, sometimes it still shows usb connected although it's unplugged and the strange fast reconnects in standby mode while plugged (usb)
but i don't know what's kernel and what's rom related just some things for you when you've got time
thanks again for your works on this rom