It would be really great if it was somehow possible to load slime-c-p-c (f-b completes to foo-bar). I tried copy the file form upstream slime, but it seems that there's a version mismatch (the slime bundled with clojure-mode doesn't know anything about define-slime-contrib).
I could try to do it myself and send a pull request, but I am not sure where to find which version of slime is bundled with clojure-mode.