One thing I noticed is that the informational popups do not maintain ON-TOP status and can get lost under a screen waiting for an answer causing the system to appear to be hung. This is also true in Mach 3.
The other thing that might be nice is to allow a different color to each imported layer, rather than to the arc and circle attribute. Perhaps this can be a switchable option. I am using different layers to achieve depth of cut and order of cut control
I also noticed that lazycam does not try to attach line segments together if they cross at the ends or come very close together. I am finding that I have to be extra very careful with the drawing connect points to make sure they are the same point, close doesn't seem to cut it. I believe the old DXF converter had a setting for finding close endpoints and tying them together.
Also the program wants to assign climb-mill mode to all chains, which effectively reverses the direction of the cut. Will you be eventually having a preferences setting for this? The "Rapids Options" section seems to be headed that way, although it seems to do nothing at the moment.