I don't recall other issues or discussions about lining up short and long option strings.

Producing a more compact invocation has raised in StackOverflow questions.  I don't recall if there has been bug/issue on the same.

If I recall correctly it isn't hard to identify and change the Formatter method that produces the action invocation.  So such a change could be implemented as a Formatter subclass.  A SO search should produce that.

You can also play with the metavar of an argument to produce a more command invocation.

The formatting of choices has been discussed in other bug/issues. 

The ultimate help formatting method is to SUPPRESS the argument help, and write your own in a (RAW) description.