This OP is fucking dumb:
1/ Bobby is right, Segd will make a mode to implement a crosshair, and many will use it. Just as currently many are using mids that: remove fog, remove all non-solid foliage, add big coloured sticks to all player models so they are visible behind walls/trees etc, add high-viz arrows etc. Since nothing is ever done about this, or the persistant use of macros by some players, we must assume modding the game in ALL ways except autoblock is 100% allowed. Personally I consider all these things cheating and should be a permaban, thats not the official stance.
2/ NOOBS! You never put blutack or some shit on your screen: A small piece of sellotape (or any transparant tape) over your screen's center, and then use a soft tipped marker to draw in your crosshair (You do this in native or any FPS game to ensure your crosshair is accurate). This takes 30 seconds and costs nothing. Source: used to play DoD for cash-money.
So, no.