Multiplayer fighting game macro

I was watching my nephew play Counter Terrorist Strike Force. Teams of commandos scramble about fighting each other in a first-person shooter realistic setting. There is strategy but a lot hinges on quickness.

Could one tack on a macro that runs on your computer alongside the game, enhancing your reflexes? This macro buddy can be turned off and on and would execute an action (one of the ones the player can execute) on perceiving a change. For example, it would fire the gun if one of a range of colors appeared on the screen. This would allow you to shoot thru the crack of a door at the very moment an opponent ran by on the other side. Other maneuvers which require split second timing might also become more possible.

The macro could be used for various games. You would teach it first. For example, teach it what command fires the gun. Teach it the command that makes the player crouch. A given color appearing on the screen is a thing common to many games. Teach it which colors to watch for. Then set up what you want it to do during your game.

Is it cheating to have a macro buddy help you fight unaugmented opponents? Is it cheating for your human body to be in good physical shape and so more capable of sustained focus? I say if the game itself is unmodified, any thing the player does to help him/her win is fair.