Can you think of an easy and efficient method to translate the horizontal movement (and input) of the Platform behavior into rotational movement around a loop? I can't. It just seems to me that you'd need to fudge with the speed and gravity settings of the Platform behavior way too much. I mean, when you press left, the Platform player moves left... how do you tell it you want to move Up or Right instead, and make the transition seamless around a full circle? Yeah, it's probably possible, but that's so many basic functions of the Platform behavior that you're making workarounds for that it hardly seems worth it to me. If you have to change the fundamental movement so much, you might as well go completely custom and save yourself the headache.
I'm sure Quazi could, though.