[X2Go-User] x2gobroker: war of passwords

Hi, I am running x2gobroker with SSH proxy and right now users have to type:

1. broker username and password
2. desktop and username and password
3. proxy password

A lot of typing for just a simple desktop connection! I've learned I can use ssh key autologin somehow (didnt try yet) so step 2 will be gone. Is there a way to have x2goclient reuse the broker password for the proxy connection or something else to remove the ssh proxy authentication without distributing private keys to the users?

cheers Mathias