Yeah thing is, with readability, you also have to consider expectation, as in you're reading efficiency includes the ability to expect what's coming too. I'm not sure all caps improves that or could hinder it. But one way that I'm thinking is this, how the jumbled inner letters can still be read. I'd be interested in a test with people and this using all caps vs normal sentence case. http://www.mrc-cbu.cam.ac.uk/people/matt.davis/cmabridge/