Maybe someone else can be more useful, but from what I can see this isn't easy. Maya provides commands like menu, and menuSet, that allow you to add and reorder menus, but you can't add menus to the default sets, and you can't have a different menu set show up to the left of the "Common" menu set.
You could do it by editing the file <drive>:\Program Files\Autodesk\Maya<year>\scripts\startup\initMainMenuBar.mel
in about a dozen places.
Much easier is changing the text on the File menu. In
<drive>:\Program Files\Autodesk\Maya<xxxx>\scripts\startup\FileMenu.res.mel, look for
displayString -replace -value "File" m_FileMenu.kFile;
(or the equivalent in your language)
and add a bunch of spaces before File, eg
displayString -replace -value " File" m_FileMenu.kFile;
It's a hack, but I don't think it's dangerous at all, just inconvenient. You'll have to restart Maya to see the effect, and you'll have to set it by hand for each version of Maya that you use.