Whenever I do M-x rudel-join-session, I stumble over having to remember the port. “Was it 6552 or 6522?”
So it would be really useful for me to have TAB-completion for that - which is provided for M-x rudel-host-session.
I tried doing it myself in the source, but I could not find out in 10 minutes where the port-question is actually asked when joining sessions…
PS: Rudel is really cool - a really nice collaboration experience with Emacs - and I recently setup a running rudel-server on my small 24/7 host to be able to easily collaborate with other people without losing the convenience of Emacs.