At WGT it is both legally and socially acceptable. Those little divots you might leave in the green will digitally repair themselves within minutes... nobody else will have to suffer because of them.
Now, in real life, it's not that cool to hit a wedge while on a green, leaving a nasty divot. But then again, some course designers come up with those greens, with a particular pin position, that demands a wedge to get close. I say if they design it then you are obligated to rough up the green to get close to the hole. We'll blame this one on the architects and greens superintendents.
If they don't want you hitting the best shot then they shouldn't tuck the flag into an unreachable corner of the green so that, even though you're on the green, you cannot putt and get close.