I've been listeninig to Georg over in the Pro/Live forum and finally managed to get sshd running on my Quad. Here's what I did:
Ran acp_commander like so
Code:
java -jar acp_commander.jar -pw <admin password> -t <quad's IP address> -ip <quad's IP address> -o
(yes, <admin password> is the password you defined for the admin user in the web interface.)
This started up telnet and cleared root's password so I could login via telnet. Don't ask me why but the only way I could get telnet started was by doing it this way and specifying the -ip parameter. Note that I didn't set my Quad's IP address to a NEW IP, I just set it to what it already was but that was the magic. Next, I had to take root out of /etc/ftpusers because that file is referenced in /etc/pam.d/sshd and controls who can login via ssh. I also had to edit /etc/sshd_config because the original specified that the hostkey comes from /etc/apache/server.key which hasn't been created. Oddly, /etc/init.d/sshd.sh creates /etc/{ssh_host_key,ssh_host_rsa_key,ssh_host_dsa_key} if they don't exist. I added sshd.sh to the step3 startup in rcS, restarted the Linkstation and sshd came up fine. I just verified everything's working by logging in via ssh.
Oh, and since acp_commander cleared root's password, I defined a new one.

Again, note that this is for Quad firmware 1.10.