The AppFog command line tool is very straightforward and even somewhat Git-like: http://docs.appfog.com/getting-started/af-cli. If the "af" gem is installed, "af push" is the equivalent to a "git push." You're right that it's not the same thing, but it's pretty handy.

Extra runtimes (newer versions of Erlang, plus Perl, Go, etc.) will become available over time. They're high priorities for our dev team, as are Redis, Memcached, etc.

What do you mean by "no custom app?"