Add Copy as PDF Shortcut in Mathematica

To add a shortcut for the Menu Item Copy as PDF you have to do the following (with a Mac) go to 

/Applications/Mathematica/SystemFiles/FrontEnd/TextResources/Macintosh
and edit the file 
MenuSetup.tr
changing the line 
MenuItem["PDF", FrontEnd`CopySpecial["PDF"]],
to 
MenuItem["PDF", FrontEnd`CopySpecial["PDF"], MenuKey["C", Modifiers->{"Command", "Option"}]],
In this way Command + Option + C will copy the object as a PDF in the clipboard.