- Camera rotation is way too slow for my tastes.

- Tools should have keyboard shortcuts.

- It's rather ambiguous, say, what the subtract tool subtracts from.

- Scaling tool must include a Ctrl or Shift modifier key to scale all axes.

- Tools must bring up a precise control box as, say, Blender does.

- Information about object positions, scales, and tri-count would be great to have.

- Not sure if I missed it, but there ought to be a vertex-level editing tool.

All in all, it seems like a basic toy rather than something that allows you to have a great deal of freedom. Can be improved upon if the toolset is extended and allows for a higher degree of control.