my ideas are

abilities to

get married

have sex and kids

buy anything (e.g. offices to pee in, village halls to burn down, cars to trash)

Every building can be entered 24/7

more real badged cars and caravans and trailers to go on trucks

every weapon of every type is at your control

a female main character

everywhere unlocked from the start

fly others via plane or kill them!

real places (e.g. McDonalds, Boots, Asda, Specsavers, GAME, HMV and Blockbusters)

PROPER car damage (e.g. Frontal impacts at 160 MPH make the car undrivable)

Nude character

Everyone Nude

Go on Holiday

Take up a career