Is there another wallet that uses bitcoinqt (for a full node) and has a single-master-password (root key) that isn't full of bugs?
My gocoin software is a full node and its wallet works on single-master-password.
But it doesn't use bitcoin-qt - it implements the node by itself.
I get the impression that to do this using bitcoinqt that I'd have to write down / print-out every private key of every receiving address ever used. Is that right?
I think the recent versions create HD wallets so you only need one backup.
But first you need to create a new wallet, with a new version of bitcoin-qt.
And then you'd probably prefer to backup the file, instead of printing it.
Not quite sure - you may want to ask here:
https://bitcointalk.org/index.php?board=4.0