E activates the two turret machine guns on the front. hit q to switch between the machinegun in the turret and the 76mm cannon. hit r to reload the turret's machinegun. the crosshair (the little gray dot) switches from plain gray (machinegun mode) to the other mode (cannon mode), when you fire the cannon. green means it is ready to fire. I have also made it so you cannot switch back and forth to skip reloading the cannon to cheat. every time you switch to the machinegun while in the cannon resets the reloading time back to 3 seconds.
thanks to vincwang for the art. I edited the code and added stuff. please if you use it in a game give me and vincwang credit.q