I don't see any problem with using a sword like a hanbo, stiff rope or in any other manner. I think that would be a benefit to the person using it. Having a lot of other options than simply trying to cut with it. Don't get hung-up on what the weapon is "supposed" to do.
As far as taijutsu for the strikes as opposed to the sword itself; you use taijutsu by simply swinging the sword. YOu still need to usually sink or rise a bit with a cut. You still should use your body. Nobody just stood there and let the sword fall. They needed to be moving so they didn't die. Doesn't matter if it was a Samurai or a Ninja, they would move and probably not just rely on their swords to cut. They would have probably kicked, hit, smacked, tripped, grappled, so on and so on. And now I have completely lost my train of thought. Back for more coffee. Take care and be safe everyone.
Joshua Reis
I'd rather die living, than live dying