Speaking of which, I was honestly disappointed that you can't dismember bad guys with your lightsaber. It turns out you can, sort of. "We'll use it in select cases," senior designer Justin Perez told me, before clarifying what he meant. Basically, droids and spiders and the like can have their legs and arms (if applicable) lopped off, but not humanoids. Blame the Disney branding folks for that one, it seems.
In fact, speaking with Tatyana Drewry Carvin, a Story Artist on The Clone Wars - Season 7, we were told that these sort of rules about what you can or cannot do when it comes to removing parts of people with a lightsaber are common in Star Wars properties, alluding to the fact that this seems to be a Lucas Arts edict.
"One of the rules we were given was to always hide the cut in case of decapitation. And never show blood," Drewry Carvin said. "The burn of the lightsaber is supposed to cauterize it instantly."
And about hiding the cut of the decapitation – a good/smart way to do it is to have a camera move and have something in the Foreground hide the spot where the head gets cut." Drewry Carvin said. "Using the motion of the camera and a foreground element – like another character – is more cinematic than using a camera cut."