If I'm understanding this thread correctly, it seems to me that learning to open up and operate in all 6 directions at once is Aikido's equivalent of learning how to throat/overtone sing.
I've heard Mongolian throat singing, which is amazing. I couldn't say whether it's a comparison to working multiple directions in the body, though. Think of the latter as attaining a harmony or balance between pulling/pushing the joints and tissues of the body up-down, forward-backward, side-side. You can throw in criss-cross (left shoulder-right foot; right shoulder-left foot) for good measure. It is driven by mental intent (the "reaching of the cup of coffee" thing).
If that's how one manipulates the vocal cords to throat-sing, then that is very cool.