Originally Posted by NiLuJe
Note that, AFAIR, FileZilla *can* handle passworded private keys, if you use an ssh agent (I'm pretty sure that it handles at least putty's agent on Windows, and OpenSSH's agent on Linux).
Sort of. It's like saying that all email smtp clients support ssl/tls if they go through stunnel.
Setting up a ssh agent is probably too much infrastructure for something that is meant to replace plugging in an usb port.