When you hold right click, he kind of holds his hand out which is a good reference for aiming too. Seems like most grenades come out close to the pointer finger. The italians is different, it comes out of the middle or ring finger. Instinctively, I usually want to throw a grende through a window or some tight space, but thats not working out well for me. Thinking about it now, its probley better to have a somewhat clear path, over something, through a doorway, or bounce around a corner. Just because I can easily throw something through a window in real life dosent mean I can do that ingame. Those are the lessons of the game I seem to have the hardest time with. I still get surprised when the jeep I just used is burned up like a minute later when I want to go to the next flag.