Since I really haven't seen many (any?) posts from cnc wood lathe users, it looks like you pretty much on your own as far as the learning curve goes.
Id play around with some scrap to determine rotation speed and depth of cuts. You should be abler to cut much deeper with a spiral bit than a ball end bit, but rotation speed will play a part in that.
As for the ball end, how about programming in 2 parts. First, do the rest of the column. Then, mount a steady rest and cut the ball complete. If, you can mount a steady rest fast enough to be productive that way.
If the part will need a lot of sanding to clean up anyway, I might think about roughing with a large straight bit, and then finish cut the whole thing with a V bit. Then put it on the manual lathe for sanding while the next one is being CNC'd. Just a thought. You're in for a bit of trial and error I think.