Would love to see multi-threaded workers. That's one of the pros of using sidekiq + redis today (it uses celluloid under the hood).
However there are clones like Shoryuken [1] that would be easier to port.
Things I can say: the ruby disque library isn't really fleshed out yet. It's alpha, so that's fine, but it's got a ways to go. For example, it doesn't directly expose ACKJOB as a command. The server is equally alpha, things like HELP don't do anything yet, and some options on some commands appear broken. But hey, it was a fun way to spend an hour.