Normalize All UV Shell
Normalizes all the UV Shell of all selected objects.
Normalize Selected Shells
Normalize only the selected UV Shells. If a Shell is not completely selected, it will be automatically selected.
New Scale Selected UV Shells
This tool allows you to scale a selected group of UV Shells to match the specified Texel Density.
It does not use per Shell information but the average Texel Density of the selected group, which you can get from the Main panel in the Texel Density section.
It is useful if you have an already packed or arranged group of UV Shells and you would like to change the average Texel Density without modifying the layout.
Open the Texture Advisor tool.
You can save custom presets for any given Texel Density.