1. Ability to modify body type.
2. Ability to have different types of melee attacks (ie brawler, martial artist, boxer, etc.)
3. Able to buy a larger variety of pedal bikes, and to modify them to taste, and to use the WHOLE rack on the garage wall, not just 3 spots.
4. Able to eat/buy a larger variety of food.
5. More tv shows.
6. More music on radios, this one I can't stress enough.
7. Make more use of the countryside and ocean. That's a lot of space that is mostly going to waste, I feel Rockstar could do something to make better use of the areas (for example hunting, fishing, diving, water deathmatches with harpoons)
8. More options to modify the Sanchez, I mean come on, is a solid color paintjob too much to ask?
9. More hair options, on top of having more styles, for example, if you pick a style, you should have the ability to have combed, natural, or unkempt hair for that style type.
10. More cars, not just Supers or Sports, but regular everyday cars, maybe import some of the unused ones from GTA 4 just to give a larger variety.