2. Level Up 
Bare with me, it's not as daft as it sounds. In fact, this feature has, to an extent, even been used by Rockstar before. In San Andreas, players could build up certain "skills" the more they played the game. By frequently driving four wheeled vehicles, for example, the player would become a more accomplished driver, and the chances of skidding were decreased. By driving motorbikes enough times, the chances of falling off your bike after a collision were reduced. It even applied to weapons. By shooting at police or cars with a certain weapon, your aim will gradually improve, as will the range and effect. If you increased your shooting skills enough times, you would earn the ability to walk whilst shooting, and be awarded with the tag of "gangster". These skills also applied to flying planes, if you did that enough times, you would eventually be awarded a pilots licence. I think this feature should not only return to GTA V, but be expanded upon. "Perks" should be made available in the same way as they were in Skyrim. We should be able to earn the abillity to decapitate enemies with certain weapons just like in Skyrim; we could even unlock the ability to modify certain weapons or unlock new ones.