Could be a combat style, a sort of two weapon combo, of course you would want ambidex for it, but still.
This of course opens the question about quick draw, and if that skill should exist in harp, as it does in rmss/frp. or if it should just be an option with a weapon (perhaps an advanced combat action?), albeit with the style mentioned above, with scabbards/sheaths as Rasyr suggests, it could be done before reaching 20 ranks, and when 20 ranks is reached, the penalty is halved or so.
I have created a sword-catching maine gauche for my game, which enables the user to use a fencing bind before having enough ranks, and when necessary ranks is reached, the penalty is halved. It?s not magic, its mechanical/clock-work style.
or one could have a poison-vial in the hilt, which whenever the sword is pointing down, send out poison into special grooves. again it would take at least a round for these grooves to be filled enough to amount for one dose, but again, wielding two weapons can make it useful.