I'm having the same issues with NTFS formatted cards not being recognized.
Can you elaborate on the two card method? I tried booting a 4GB FAT32 in USB2 with a 64G NTFS in USB1, but the script refuses to run. I also tried booting with the 4G in USB1, then just swapping in the 64G before pressing the home button the final time. No luck.
I also have a 64G SD card, but I can't seem to get the script modifications right. I tried "/sdcard/~", as indicated by e0x70i. I also tried "/mnt/sdcard/~", "/mnt/external_sd/~" and a few other flavors, all with no luck.
I'm working on a 4