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TexTools-Blender
TexTools is a UV and Texture toolset created several years ago for Blender and Max by @renderhjs. In this open repository, originally created by @SavMartin, we develop the current version of this popular Blender add-on.
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Scout Monitoring
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If you are asking about a way to not have blender change your scale when packing, i'm not sure there is one. You can pack, then use something like Textools to apply the density to the "combined" selection, instead of individual islands. This will keep the density without adding margins. https://github.com/SavMartin/TexTools-Blender