Custom ckeditor.styles.js possible to specify for any/all elements?
I also searched for a way to specify multiple elements for one style - and it doesn't seem to be documented anywhere. I was successful with specifying multiple elements as an array:

{ name: 'Red', element : ['h1', 'h2', 'p'], attributes: { 'class': 'red' } }


This works for me in CKEditor 4.2.1.