This patch is relative to the version of Docutils (0.8.1) and rst2pdf (0.16) present on Ubuntu 12.04. rst2pdf expects its output file to be indicated with a '-o' flag, but the emacs mode only knows how to produce commands of the form:
command [options] [conffile] input_file output_file
This patch adds an "out-options" record to allow:
command [options] [conffile] input [out-options] output_file
This may not be useful to anyone, since it looks like the current development version of rst.el has changed a lot since 0.8.1. That's OK with me.