Industry standard rigging for better joints.  Poser's joint handling drives me nutso.  I would pay for better joints.  I'm not sure what else I'd be willing to pay for.  A less crash-prone clothroom and hair simulations that work properly, perhaps.  And hair design tools that use dials so you don't have to fight with the interface.  And Python access to the mouse interaction in the 3D preview.  And a morph tool that's less like Amorphium and more like the Wings Tweak tool.  And some kind of built-in .cr2 editor, since so many Poser features require manual tweaks of the files.  Oh, heck.  I want Poser to stop being Poser, don't I?  Hmm.

But anyway, better joints.  That's the big thing.

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Cage can be an opinionated jerk who posts without thinking.  He apologizes for this.  He's honestly not trying to be a turkeyhead.

Cage had some freebies, compatible with Poser 11 and below.  His Python scripts were saved at archive.org, along with the rest of the Morphography site, where they were hosted.