Im new to CNC so excuse my naivety.
I know itd take more resource, and I love the light, fast, attitude of Carbide Create, Build 43. But, it would be nice to hide/show tool pths during the design mode. I find that when I need to create overlapping geometry for overlapping tool paths, I often check and recheck, edit and re-edit the geometries to match according to different tools. Sure, calculating diameters in my head helps.
My most common annoyance is when I create a shape with many points smaller than #101, 1/8" pointing into my geometry like as in a comb. Or a pocket shaped like a 7 pointed star. I rough the main shape with 101, then clean up the points with a 112. Knowing where the 101 limit is into the vertex would make drawing the 112 geometry much easier. I work a lot of free forms, so copying the small pockets isnt always possible.