SS can be TWF'd. Also, it is a slashing weapon, IIRC. TWF Dervish applies...
Lastly, IIRC, you can trip with it. If so, if you are using it to trip, the -4 to-hit for TWF is not going to hurt as much since the initial to-hit roll is a touch attack, and after you tripped him, the penalty goes away.
A tripping based TWF Dervish using two of these weapons sounds... tasty...