[Razturach]

- Saving system ofc
- Lottery
- Driving school
- Many different jobs
- Hobbies like fishing
- Cars around map that are locked and can be stolen
- Actually Car system - vehicle ownership, fuel, speedometer, vehicle pimping etc etc..
- Houses
- Businesses
- Paychecks
- Police,FBI, Medics, Fire departments
- Families
- Animations
- Starting tutorial ??
- Something unique - up to you
- bombing system?
- Hitmans?
- Decend, detailed scripting overall
- Mask system
- Drug system
- Costumized weapon damage
- Phone system
- Traffic cameras?
- In game events - earthquake, tsunami, tornados, terrorist attacks w/e

I hope I gave you some ideas what you should contain.