Keep in mind you'll need to include as an option, the memcached url.
I'd suggest reading:
http://beaker.groovie.org/configuration.html#options-for-sessions-and-caching
Which shows how to configure Beaker for memcached. Also, if you are
frequently using the same set of options:
http://beaker.groovie.org/configuration.html#cache-region-options
And rather than using cache.get_cache, I'd suggest:
http://beaker.groovie.org/caching.html#cache-regions
Cheers,
Ben