RE: multisignature transaction dangers: I'm completely convinced the (large, practical) benefits far outweigh the (small, theoretical) risks that it'll be abused by some repressive government(s).
Wait, so OP's scenario is plausible?? I thought the multisig transaction idea was suppose to have a backup wallet where you didn't need anything else to have access to your Bitcoins?
small theoretical risk =/= plausible. There is a small theoretical risk that all life on the planet will be exterminated via events we either will not be able to detect or will be powerless to stop.