My Sentinel seemed to forget her second saber in every cutscene; I am not surprised that Shadows/Assassins would forget to light the second half of their saberstaff or stab themselves.

I wish they slung across the back diagonally.
Ooh, there's an idea! It probably wouldn't work that well with Togruta and Nautolans, though. Perhaps they could do something similar to the robes that have hood up and hood down versions, and give multiple weapons with different holstering options? 2-3 of back (vertical), back (diagonal), and hip?

Thank you for the recs! I'll look at the Derelict Saberstaff and Vindicator's Saberstaff and see how they sit on my BT2 Shadow.