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to 1.: Of course I can create a user. :) For my fellow
administrators I would consider
it a significant improvement to streamline that installation
per default.
The good side of defaults is that they give good suggestions
if people are undecided or lost in details during their
attempt to just get something running.

to 2: It does not necessarily need to be a mandatory wrapper.
Just the wrappers would add security and help the group
permission problem. You could just check out the code from
mailman and see what is possible. Even when it is not
mandatory you can make it a sane default.