How does shooting in a videogame represent any skill at all?
Sure, you can move a joystick/mouse around to aim. Is that all you can do?
In real life, a whole lot more variables exist. That's why real life top shooters are a big deal.
Take these variables for example: Wind, FPS, gravity, hand movement, timing.
Most bullets in blockland aren't affected by any of those, wind does't exist in blockland, and most guns have the same FPS, or the FPS doesn't even matter.
Your hand does not move in blockland unless you choose for it to. In real life, your hand trembles a bit, which is why you sometimes need to hold your breath while taking a shot.
This isn't a good idea, I'm sorry.