Portal - How I cheat (1)

I bound a single firing action to both the “mwheelup” and the “mwheeldown”. Those are likely the two most powerful buttons on the entire keyboard/mouse setup. Each click of one direction of a role counts as one press of a button. On Skulltag (a great port for Doom1/2) you can actually bind more than one shot to each click and have a briefly timed pause between each click, so when you role the dial back and forth, the shot's overlap each other much easer.