No Key Shortcut...

 From:  Michael Gibson
35.20 In reply to 35.18 
> And maybe also the Selection All, Deselect all, Inverse Selection will be nice on the list :)

Grendel's got them on Page #3 of his guide, here they are:

[Shortcut Keys]
A=script:moi.geometryDatabase.selectAll();
N=script:moi.geometryDatabase.deselectAll();
I=script:moi.geometryDatabase.invertSelection();

- Michael