The cursor has to be on/near the enemy for the bullets to hit (Melee weapons and snipers (Scoped) don't count), The bullet spread is wider for some guns and thinner with others (Example: LMG has large spread, Assault has medium-small spread, Pistol has little spread), More possible map interactions that can be used by or against people, Maybe for some added effects put a stance change, like if you go prone behind an object that can be shot over you wont get shot, but it takes time to go between them, also possibly make it increase accuracy, but at the cost of small/no movement.
Other ideas soon, i just thought i should put some out there for people to see.