We should be able to either position stock at arbitrary coordinates, or align it with a face or sketch curve. Below is a model based on a circular sketch. The stock will not align with the obvious [underlying] circular sketch, and leaves the bottom corners of the model out regardless of axis choice or model positioning. Unfortunately, cylindrical stock does not give the options of X, Y, Z offsets the way the box stock does. Using box stock choices works well, but the stock I'm using is cylindrical, and I'd rather not have toolpaths that cut a bunch of air!
Cylinder stock is *not* centered