A tiny bit more realtime debug info would be nice! As far as I can tell, all we can see is bounding volumes.
I could have used a normal display with an earlier debugging session*. 
Iām not sure if it would be best to implement such a thing as a part of NodePath (like show_bounds), or as a render attribute (DebugAttrib?)
(*I know you can display normals using the Egg interface, but not everything is rendered from triangles generated using that, so something a bit more generalized would be needed.)