{Weapons}
50 Caliber Sniper
M16 with a Scope
Silencers on(Pistols, M4, Hunting Rifle, and MP5)
Heavy Machine Gun
{Vehicles}
Swat Vehicles in Party Mode
Planes(Flyable)
FIB Buffaloes in Party Mode/Free Mode
{Buildings}
Allow entrance to Police Buildings
10 new Buildings that can Be Entered Online(Party Mode or Free Mode)
Nice Safe Houses(That can be entered in Online)
Enter the Bank Online(The one you Robb)
{Misc}
Use Cell Phones in Party Mode
Add Limos to Online(Party and Free Mode)
Suits for Online(Party and Free Mode)
{#1}
A new Island for Multilayer and Story mode
Please do not reply back mean to this, this is only a few things that i personally think would make the game better, i play GTA IV all the time so i think i know a little about what would make it better.