Your comments

Is this still on a todo list ? I've just had my first need for this feature, and agree that it feels a bit odd. E.g. in Prompt (SSH client) two things make this better: the key is 'deleted' (presumably copied to somewhere internal / not user visible) after import, and secondly the user can be prompted to provide a passphrase each time a connection has been made. I guess this is just echoing earlier comments, but it does feel a bit primitive / dirty without it, and I'm not overly comfortable using it for SFTP for that reason, which is a shame.