Currently the 3DEN camera slows down when you're close to an object surface or terrain. This can sometimes be jarring and undesirable.
Situations like where you want to go from one side of a building to another, but the camera moves really slowly. Or there is a steep hill in the way when you want to go from one side of it to the next.
My suggestion would be to add a button control that toggles this behavior on and off.