I use the Pfeil V parting tool, I think it's the 60 degree one, I don't know the number. I've gotten quite handy with it, if I do say so, myself, and can do my incising rather quickly just pushing it with my hand, mostly. For curves I will tap it around. It's wood engraving....which means I should be able to engrave, right?
I do almost everything with it now, incising and outlining relief carving, except for some odd shapes, or the little gouge stab ))) cuts.
Incising leaves you NO room for error, though. If you mess it up, it's probably stuck that way forever, as it's pretty hard to "push" an incised line over to where it should be.