While i'm pretty certain you can't do what you're trying to do with just a push pull pot, you'd be able to do that with a dual stacked concentric pot, which, as the name suggests, is just two
pots stacked on top of each other. The top knob could be the volume and the bottom knob could be tone, or whichever way you choose.
You would also definately be able to use a two way switch as a killswitch.