So I downloaded 3 compatibility zips from here: [rom] Unofficial CyanogenMod 9 for many AllWinner A10 tablets - xda-developers and looked through them.
In all 3 zips, they flash "script.bin" and "script0.bin" into the /bootloader folder of the tablet ("/dev/block/nanda). I have really high hopes that this is the part that's missing!
if possible, could you please make a dump of your nanda, or provide copies of your "script.bin" and "script0.bin" from your /bootloader? I am not sure how to put them into my tablet, but I guess I could put them into one of those compatibility zips and flash it.
If this does fix touchscreen/g-sensors, that means a compatibility zip for cm9 or cm10 is possible =)