You know, the only reason I even use the 3d view in Pleasant 3d is to look at how the layers overlap, i.e. how much does the current layer of a curved surface(overhang) overlap with the previous layer or the next.
Could you possibly just add a toggle for ghosting an N range of previous and next layers within the 2d view? This would be super useful for checking overlap. Sometimes if I'm really concerned, I'll screen cap a few 2d views in pleasant 3d, and overlay them in photoshop at 30% opacity. I havent seen a gcode viewer that offers this functionality. It would be useful for this user! :)