Supporting the idea that megalithery pre-dates farming (in the conventinal sense), is the fact that Aboriginal Australians raised megalithic stuctures. They didn't farm the land, unless you count deliberate starting and guiding of bushfires as farming.
On the subject of Balkan figurines, Marija Gimbutas' Gods and Godesses of old Europe, shows a lot of Vinca (?) faces, which display serious temporal lobe influences.