I've tested this settings and all I know is that this option was assigned properly to the ckeditor object but it doesn't work as it should.
You can test all ckeditor objects on the site with JS console using such code
for (key in ckeditors) { ckeditors[key].config; }
It gives me EnterMode = 2... Well I've figured it out right now... "enterMode", not "EnterMode"
Proper config file:
CKEDITOR.editorConfig = function( config ) {
// Define changes to default configuration here. For example:
// config.language = 'fr';
// config.uiColor = '#AADC6E';
config.removeButtons = "Save";
config.enterMode = CKEDITOR.ENTER_BR;
};
However CKEDITOR recommends to not use <br> as enter mode.
Regards,
Adam