No lightsabers! Commandos use vibro-knives. You want them get Jedi Academy. Its an excellent game.
I could see fighting opponents with lightsabers however, like the Magna guards and their electro-pikes.
A Mandalorian campaign would be cool, especially as they've been around for over 4000 years so there's a vast arena for stories, but I'm not sure it'd be a good expansion/sequel to RC.
It would be nice to use some vehicles ala Halo, but given that you have the squad, and the maps don't seem to be as large/expansive as Halo, Its probably not necessary.