a rare kind of single bladed lightsaber that allows the user to have the conventional length blade, or quickly extend the blade to double its normal length.
there also the fact that a lightsaber's blade is weightless since it is energy so you could probably loose control of it very easily so it would be pretty hard concentrating on one saber let alone two.
One thing i wish they had in A game would be a dual phase lightsaber (like the Halcyons) adds to the intimidation factor against non-jedi opponents