Hi archfrog and welcome to PS.
I'm pretty sure the password info (SHA256) is written to one of the config files, so it can be remembered. Maybe there is a way you can insert it there. Neeno's mods (see my signature) support copy/paste for chat, and some of those features are considered for inclusion in some future release, however, I never checked if the paste buffer also works for the password field.
Concerning git(hub), there is this topic:
http://www.hydlaaplaza.com/smf/index.php?topic=41990.0EDIT: Good news.
First, PS Extended indeed allows to copy/paste (middle mouse) to the name and password fields of the login screen.
But you don't even need to use the client mod, you can just edit a config file.
In your PlaneShift user data, check this file:
~/.PlaneShift/planeshift.cfg
There should be a line similar to:
PlaneShift.Connection.Laanx server (Main).Password256 = 50d858e0985ecc7f60418aaf0cc5ab587f42c2570a884095a9e8ccacd0f6545c
In the above example, the password I tested was "example". The hash written by the PSclient was the same I got from the first hash generator page that the duck (or google) found. Now, I would not paste the actual password to just any web tool, but as you're using linux, there should be no problem to get your hash via the shell
echo -n mypassword | sha256sum
Hope that helps