- making a texture on a face independent from all other materials/faces
- cropping a texture to the face
- baking any UV distortion into the image file; thus the resulting texture pins are arranged in a rectangle (especially for exporters that don't support distortion)
Edit: Most of this has been merged into Texture Resizer with lots of more features.
- Windows (requires ImageMagick) If you don't have ImageMagick installed, you can download it from the official site or from here ImageMagick.zip. Place the folder "ImageMagick" into the SketchUp\Plugins folder or a location of your choice.
Select faces with the same texture,
Plugins > 'Make Unique Texture ++' > 'Make selected face(s) unique'
Plugins > 'Make Unique Texture ++' > 'Crop texture to selection'