Dunno. There's something about Poser that screams "hobbyist" way to loud.

Maybe a highly professional order that's done with only productivity in mind is not the right solution.
Whole Poser itself isn't designed for high productivity.
It's more like some tuned gameeditor that lacks a real script interface. HoMM V Editor, UnrealEd, NWN Toolkit, SpellForce Editor, Earth 2150 MapEditor are all designed for productivity in some way.
Poser is closer to these applications than to pro 3D apps. That's actually a good thing.

I have to say that I'm happy about the fact that some people enjoy it to provide content for the community, freebie creators or vendors, it doesn't matter.

Poser should stay with this trait of an fun-application but something needs to be done to manage the huge amount of 3rd party content.
The ability to create and rename, copy and cut folders and files using the Poser GUI and a decent script interface with syntax highlighting is something that e-frontier has to take care of.

Regarding the 3rd party items it would be useful already if they find some conventions and stick to them. That alone would already help to limit the organisation work/time for the user/buyer to acceptable amounts.
Only thing required is that everybody sticks to such a convention what shouldn't be asked to much sice industry can do it too and for many decades already.