Another reason cut3d breaks cutters is because it can't comprehend flute length. If you have a face that is larger than the flute, you will make it down (as the cutter is eating into the face creating a clearance) but on the way up no more cutter...
I think model slicing would be an excellent way to deal with this. For example if I had a 4mm cutter with an 8 mm flute and my object had a 15mm face, I could slice the model into 2 pieces. By cutting the top slice first, clearance is created for the bottom slice. The trouble with this in cut3d is that model slicing seems to think you really do physically slice your model (what the!) and so it overlays the face edge with a tool path. When you bring the two slices together (attached pic) you can see how the tool paths do not work on a solid billet that isn't sliced.
If Vectric remove the edge overlay/lapping or made it optional, then this may allow for flute restriction?
Cheers
Attachment 300030