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The attached file shows how the default argument groups could be redefined, using 'required' as the criteria.
I've implemented it as a method that is added to a subclass of ArgumentParser. This method is invoked after arguments are defined, prior to generating the help.
The help looks something like this:
 usage: alt_grouping.py [-h] [-f FOO] -g GOO pos [baz]
 required:
 pos required positional
 -g GOO, --goo GOO required optional
 optional:
 -h, --help show this help message and exit
 -f FOO, --foo FOO optional
 baz optional positional
I was thinking of implementing this as a formatter subclass, but given the way the help is assembled, invoking this method from the parser is simpler.