I would like improvements in the cloth room and hair room. The thing about rendering the edges of dynamic cloth thicker is a great idea. The Hair Room just needs to be better all around. Better hair shaders, better handling of memory so hair doesn't go through things it's supposed to collide with, easier styling. I still use the hair room, but honestly, I think it's gotten harder to use in the later versions of Poser, rather than easier.

I would also like to be able to use La Femme (and L'Homme) in the Face Room.

Let's see, if we're limiting it to 5 items, I have two left. I'd like better toon rendering options.

And I'd the ability to lock the workspace, or remember the settings. I sometimes accidentally drag a palette where I don't want it to be, and it's a pain to try and get everything back the way it was.