1. being able to select multiple objects/figures in a scene.
2. being able to delete all except currently selected objects
3. move multiple selected objects
4. copy and paste any type of morph from one figure to it's duplicate
5. move prop in front of camera button, often times you add a prop from the library, but it's not in front of your current camera. give us a button that moves the prop right in front of the current camera.
6. when setting a parent for an object, make the hierarchy list collapsed so we don't have to go through that long list just to find the object we want to be the parent.
7. shader groups and being able to change multiple shader values with a single change. example: change a reflection nodes quality value from .2 to .05 amongst all of v4's skin materials. that way I don't have to go through each skin to change the reflect value.
8. being able to select a light and hit the delete key to delete it

i just want to add that the reason I use poser is because of it's fast rendering times. Most other renderers like iray, daz, octane are too slow.