Sure agree on this one, even though I don’t need it for my own game. I guess an editor that
- imports already prepared egg files and displays them in a hierarchy list
- rotates, positions, scales those egg files in the scene
- swaps UVs
- place tags for lights, water, sound objects
- exports an egg with relative paths only holding other egg objects
would already do a lot of good.
The other things you proposed are quite advanced. While they might be useful to some, many others just would never get there.
Another thing is particles or the particle editor panel, which afair does not run here on the Mac.
pview could display thing like scale, coordinate arrows and coordinate maxima.