This looks really cool!
One question. I have a firewall (ufw) that is blocking most ports (I have a small whitelist). It looks like Mosh uses a UDP port between 60000 and 61000. Is there a way to pick a port for Mosh to use, or do I have to open that range of ports? It's not a huge deal either way, but it would be cool if I could tell it to use a specific port.
Oops. Nevermind. It looks like -p is what I want.