I would take a look at sphinx-domains, a new concept which comes with 1.0. A domain defines the directives, roles etc. to describe a language so you can document not just python but any language. Currently there are domains for python, c, c++, javascript and a std domain for application parameters and environment varibles etc.
Changing the Python Domain so that a ! is added at the beginning of every function name shouldn't take more then a couple of minutes tops and furthermore you don't have to worry about builders. http://bitbucket.org/birkenfeld/sphinx-domains/
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