Having seen radar altimeter option on SR2, I got an idea that same code can maybe be used for reliable ground effect. It would add a certain amount of effectiveness to wings when close to the ground. Of course, it wouldn't be sudden. Lift would steadily increase as you approach the ground.
For those of you who haven't heard of ground effect, here's a Wikipedia article on the subject.
@EternalDarkness "Lift would steadily increase as you approach the ground" - nope. Ground effect reduces drag, not increases lift. And you can't emulate it just using AGL - too many variables in play. I'm afraid it may require accurate airfoil model and probably finite element wing+environment processing, which I don't think is within the scope of this project