in the dresdenverse Jedi are lawbreakers, power-wise.
i would give the sword stacking Claw for more damage,
Give the user supernatural speed when using the lightsaber, on top of his already inhuman speed, which would cost -2 on the sword by putting a prereq, you can't use it unless you have at least inhuman speed.
non jedi would cut their faces off with ls.
Easy to conceal? that sounds like a veil to me, or some sort of glamour. That would be a -2 for a small one, however there should not be any roll since its on/off. How about you put 2 points for a -1 for a +4 to stealth? its not defensive or offensive and very specific.