For me?

Resume render would be a big bonus!  I like the idea of cloth moving with a figure without having to re-simulate multiple times. The hair room is a nightmare.  Soft body dynamics would be nice for animations. I'd also like to be able to add frames to the beginning of an animation, rather than just the end.

Backward compatibility is important, but I'd also like to see the program move forward. The things I can now do with Genesis have intrigued me.

Too much to ask?