Thus, if you split your paper backup into 3-of-5 like my example above, in order to recover the secret you'll be typing 3 kB into Armory by hand! That's a lot! Originally, I was just planning to wait for the new wallets which will only require backing up 160 bits, which is a lot better (and about the best I can do).
Actually, one of the reasons it would be great to have this in the GUI is that you can create a QR code for each sheet of paper. That way it doesn't matter as much how much data there is. Netbooks have built in cameras and can easily scan the codes.
That is the plan, correct, to have a QR code for each split paper backup that could scanned in easily?
With this feature you could keep a brain wallet by memorizing a passphrase but also backup the generated private key by splitting it N-ways among family, attorney, etc., in case of death, and put recombination instructions (and may one of the split QR codes) in your will.