And for usability, I think it should say "Fast use for Internet transactions." I can hand you a paper wallet pretty quickly if we are next to each other 
I don't know. Getting a paper wallet from someone doesn't seem transacted until the coins are removed from it. Who knows who else may have seen it or have a copy of it. Until exclusive control of the coins it contains is established, is it a completed transaction?
That's reasonable. Although it takes virtually no time to sweep a wallet, and then the transaction is completed. The funds aren't in a paper wallet anymore, but the transaction is complete and it can be fast. I still think this should say "Fast use for Internet transactions."
Also, what stops a USB Flash drive from being BIP 32? Seems like it should be "possible"