Quote - Mat zones on an item aren't always UV mapped so that the scale is the same for each zone

Good point. Indeed for the tileable mail textures that prompted this question I use different U/V_Scales for different materials.I did this so that the scales (as in scale armour/dragon scales) from different materials looked roughly the same size in the render.

I envisioned users thinking "oh, those scales (as in scale armour/dragon scales) look a bit too small, I'll just make them all a bit bigger". So applying the same percentage to all materials would be perfect in this particular situation. (My cobbled-together DS 'set tiling' scripts set an absolute value - I'll have to amend that)

The Poser 6 PoserPython Methods PDF I found on my laptop looks fairly good, so with that and your script as a starting point I should be able to work out how to do what I want.

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The 3Dcheapskate* occasionally posts sensible stuff. Usually by accident.
And it usually uses Poser 11, with units set to inches. Except when it's using Poser 6 or PP2014, or when its units are set to PNU.

*also available in ShareCG, DAZ, and HiveWire3D flavours (the DeviantArt and CGBytes flavour have been discontinued).