I think its great that you have found a CAM software that you are happy with!!! Most of us search forever just to settle on what our boss will spring for.
Undo would be nice. Also better toolpath containment. Ease of editing existing toolpaths (i.e. adding or subtracting geometry) would be cool too. Toolcribs would speed things up for me too. Dual turret turning I could use. Surfcam's 5 axis trim is the cat's pajamas. Building on that, a full integration of Module Works would be great (I am an ex MasterCAM user). Customizable speed and feed calculators would sure help the apprentices in my shop. A nice user interface for customizing post processors sure would cut down my support calls also.
Besides that, I am a Surfcam believer!!!!