Haven't read the whole topic yet, so if I took something someone else put my bad.
1. Apartments outside Los Santos.
2. Crew Emblem Tattoos
3. Every car available for purchase from the in game internet. Or at least give us an easier option of selling/trading our own vehicles.
4. Vans (besides Youga and Paradise) being customizable.
5. A (expensive) Lester ability that lets us steal and use specific police vehicles for a limited time (I understand why they don't want you to have them for races and such, but we should be able to get some for missions)
6. The ability to re-arrange the vehicles in our garages.
7. Leaving vehicles running when we exit them. (this might be in, I swear ive done it a few times, but its different from GTAIV if it is in)
8. After completing a mission for Gerald/Simeon/Martin/Etc we should be able to select it form the jobs option in the online options menu like all other missions in the game.
9. Passengers in ALL vehicles should be able to use Assault Rifles and Shotguns.