If you have basic CAM and a clue you can generate the required paths for dovetail cutters to cut dovetails, at it's simplest you can tell your CAM that the cutter is the largest OD of the dovetail cutter, use the geometry at the base of the cutouts and fudge it a little to ensure that the Z moves take place off the part.

Taper cuts with taper cutters don't always need 3D CAM that can use the cutter shapes, just someone making intelligent use of the tools available to him,

- Nick