Steve2golf: What if the cheat just used a program to have the mouse click when a certain pixel turned a certain colour. Is that even possible
That's possible and can be combated in other ways. The random delay after release until the meter start moving battles the timers easily. For pixel sensors, random positioning of the meter would make it difficult for the programmers.
The meter can stay stationary until the release, then, move to another place when released. It would not be impossible to create a pixel sensor that you position after meters position has changed, but it would be more difficult.
The "slow down the machine/flash to get a a frame by frame movement" could be detected by checking the actual time, in milliseconds, that it took the meter to run a certain distance and compare it to estimated time. Upon release, during the random delay time, it fetches a timestamp from the server which it sends back in the same package that contains the data for the actual shot.
Whatever they do, they must make sure the gameplay for those who does not cheat suffer. Our brain is depending on consistency to be able to tell our trigger finger when to move and if the meter ain't consistent, we wont be either. A machine, on the other hand, will not get distracted.