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Please open individual issues to address individual modules that you would like to contribute to improving. Adding/fixing help is often best done by rewriting the argument parsing...contributions have been made to improve several modules already. In most cases we don't have tests for the -m features, and those need to be created first. In some cases we don't really want to continue to support whatever -m code exists (because it exists for no-longer-relevant historical reasons...though that doesn't apply in the two cases you reference). So each module needs to be addressed individually.
To address the specific issue you raise: I believe that when we have rewritten things, we have chosen to follow argparse's lead and support both -h and --help for the display of help information.