Ever since I saw that rollerskater in Vice City all those years ago, I also want skates. A skateboard too would be awesome.

Other things that I've seen in much older video games:

• Dual wielding weapons (this was a feature in True Crime games). A katana and a gun would be sweet.
• Limb deformation (this was a feature in GTA:VC and JediAcademy games)
• Chill pedestrians. The simple ability for a situation not to escalate.
• Children. I just want to know that they can exist. Happily teleport them away if they're in danger.
• Waterskiing.
• Kite-surfing
• Slow-motion toggle in single-player mode. Sometimes you want to appreciate the spectacle of the simulation.
• Seamless interiors. I want to dive out of a skyscraper window.
• A hard to fly jet pack. It should not be easy, or stable.
• Car bombs (was a feature in GTA2 and GTA3)
• Deformable landscapes. Not permanent, but if I bazooka the ground, there should be a trench.