To implement an additional combo extension, you need to have the rokushiki ability (although this is optional) and have a bazooka. Choose a convenient macro activation button, I have it «V». Make two strokes and then turn on the macro. The macro will do all the work for you, and you will only have to switch to the slot with which you want to strike. If you like it, I can also create a similar macro for the 2nd and 3rd slots. In this case, the macro is designed to use the first slot, and the bazooka should be in the fourth slot. Enjoy the game!