Autoprogram with custom Formatter

I'm using autoprogram to document a Python script that uses argparse with a custom Formatter class that inherits from argparse.ArgumentDefaultsHelpFormatter and argparse.RawDescriptionHelpFormatter.
The RST string returned by the render_rst() function defined in autoprogram.py is not aware of the formatter and therefore the default value (default = xxx) is not added to the help string.
I noticed that the parser instance inside the make_rst() method of the AutoprogramDirective class defined in autoprogram.py has a _get_formatter() method that returns the formatter and that the formatter object has a _format_action() method that correctly formats the action. I do not know if this can help in adding this feature to autoprogram.py but your opinion would be very appreciated.
Roberto

Start in autoprogram.py by tracing render_rst() and AutoprogramDirective.make_rst(), then inspect how the parser's _get_formatter() and formatter's _format_action() are used. The work is done when RST generated for a parser using a custom formatter includes the action's default value in its help text.