I don't know it this could be useful for someone, but for my needs, I've written a tool that lists all bitmaps used by a figure, sorted by material list.
Actually, I don't check supplementary layer but I could add this.

It scans the currently selected object (prop or figure), check for the actual renderer and starts investigating  from there.
It's currently in my toolbox but if someone finds this useful, I could easily create an independent tool.
Currently tested on Poser 13, but I think that it should be easily doable to make it Poser11 compatible.

𝒫𝒽𝓎𝓁

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