Digging a real foundation into the limestone here is a futile exercise ... concrete slabs crack here, too, and is that ever a pricey enterprise!
We sure do, all sorts of foundations in between. The Ozark topography is a lot like the Hill Country, even to Karst Topography. Red Cedar posts form the foundation for lots of homes in MO. We have them for our front porch supports. Over 90 years and going strong when we rebuilt the porch in in 1995.