Nope, if used with a splinter pistol it actually gives +3 attacks. +1 basic attack and +2 Djin blade attackes that can hit yourself.
It is like Erebus said. If you use two one handed, non specialist weapons you get +1 attack that benefits from all special rules of your main weapon.
If a weapon grants bonus attacks, like the Djin blade or Scissorhand do you can only use these bonus attacks, if you use this weapon as your main weapon.
So if for example you use a Djin blade and a Huskblade you always get +1 attack for having two weapons, but all other special rules depend on your main weapon.
So with a Huskblade as main weapon you get +1 attack with ap 2 and instant death. If you use the Djin blade you get +3 attacks with ap 3, but without instant death.
I must rule with eye and claw — as the hawk among lesser birds.