I should do this for ssh password entry. Running ssh-agent is still 90% of the story, but it comes up often enough that I'm on a terminal in a remote machine or inside a screen session or something that it would still be awfully useful to be able to just autotype it.

Does it require installing 3rd party software on the host machine? This might not work great for this kind of "shadow IT" application in all environments, whereas one that acts as a USB keyboard might be more versatile.