I was hoping that someone would site something from the book 'Shatterpoint'....
I'm not sure about juyo, but mace did create and use the vaapad lightsaber system that apparently even yoda could not master....This did bring him very close to the darkside as everytime he used it he had to hold back.
Also if no one in this thread has read Shatterpoint it's probably one of the best Star Wars novels imo...