So I just got a new toy: the Wacom Art Pen (sometimes called the 6D pen, I think). It is the one that has a chisel-tip, so it *could* work like a calligraphy brush, for example.
In Painter, they have a set of brushes that use this pen's features... though of the 8 or so, about 5 crash Painter on my system!
It would be wonderful if AR supported this pen, too! (please!)