1. Lights and cameras support. We should be able to see any lights and cameras visible from the active camera
2. It would be nice to be able to edit the range and color of lights. This would save having to go back into our modelling app to tweak and re-export. I can think of some situations where tweaking the range/intensity of a light would come in handy.
3. This could also extend to blocks. Useful for tweaking waypoints or nudging collision areas.
4. Labels should display above geometry, lights, and cameras if the mouse cursor hovers over them. For example, "blk_door" would display above the block with that name or "light01" or "camera01" above the camera or light with that name(this would require #1 to be implemented).
Also, if you create a "free" camera in MAX, SceneEdit will not recognize it. It seems to have no problems with "target" cameras, though.
The 3D section of the manual doesn't reflect the recent change the 3D tab. The picture is from before the override FOV feature was added.