Can you explain 'dual state'?
There is provision for two scripts, so that is obviously not what you are looking for. The smoothness of curved lines (or circles) is not impressive, but that looks to me like an antialiasing issue.
Image toggles was just added literally a few days ago. Do you believe that he screen tools will not be improved from this point? To my eye, unlike MACH3, Mach4 seems to be getting a lot of attention and is coming along well, so I am optimistic.
I was speaking to one of the engineers at MachMotion today and they are very high on Mach4. That is one of many indicators that Mach4 will be a stable piece of software. Fingers still crossed, but so far so good, I would say.
In any case, I am having fun with the new screen goodies. FormBuilder gets pretty boring pretty quick.