A SPAZ is meant to be a lethal weapon. I see no reason in adding a non-lethal function to it, while it's main use is army forces. Now, you're telling you not only want to have a toggleable lethal in a regular shotgun but also, in a Combat shotgun, making it a nobrainer in how a cop should play. So it'd be a "I give a fuck about choosing between utility with a regular shotgun or lethal damage with a combat shotgun because I can have the best of the two worlds with a toggleable combat shotgun". Nowadays you guys want it too easy, it's the day and I barely see any cop using a Shotgun, while you get like a lot of advantages out of a simple slow.