The only camera setting that should make a difference is don't set your PP too flat. You want a distinct green color.
More important is to make sure the green screen is lit as evenly as possible. If using cloth eliminate wrinkles with lots of extra spring clips.
Don't let the talent get too close to the screen. Reflected green light from the screen will cause a ton of problems. Don't get let shadows hit the screen if possible.
4.2.0 color isn't the best, but you can still draw a decent key and feather the edges.
THANKS...I've lit and shot MANY green screen situations. That isn't the problem. I just want to know good settings for the F3 as this the first shoot of green screen with this camera. The shoot is in a studio so the green screen/lighting shouldn't be an issue, I was looking to see if anyone had some recommended settings on the camera.