Did you already have a look into the "DataPath Configuration Tool Cheat Sheet" www.cypress.com/ <- there?
Here the selections are explained a little bit (WHAT is a "little" bit? a bit is a bit! Schroedinger, please help me!) better than in other documentations.
yes, the cheat sheet is is one of the documents which are always open when digging deeper into PSoC ;)
You're right, the bits are described, but the cheat sheet doesn't show the behaviour in detail for a given combination of bits. I'm aware that my above configurations are non-usual and I can't imagine a case where they're useful. I asked just for understanding the internals =) And the understanding is growing...