Slope with Reference option added causes symbols to follow the plane that they are sitting on.
Looks very promising. I hope this is what I had been hoping for. I should be able to create tile ridge cap symbols that would plane with the roof rather than messing with the y rotation all the time. It should work well with the off ridge vent symbols as well. Again, assuming that is what this can do. Though I am still holding out for the ability to rotate in the y axis...