General improvement in navigation, zooming, selections would be great. Creature House's Expression 2 has a very clever way to zoom in/out : the mouse wheel (test it). They also have an intersesting way to enter numbers. A function to create homogeneous and random dispersion of objects would also be great (for example, to evenly disperse a group of 46 chromosomes in a cell) may be usefull. For the animation, I suggest this : I often do a mistake by forgeting to go back at the first (or a specific) frame before changing an object, thus inadvertidly creating a new keyframe at a wrong place. Thus, it would be good if there could be some kind of a switch that, when on, would reverse to a specific frame each time a modification is done to something.