Auto create masks from materials and remove all materials assigned to mesh
It's seems compositing texture sets into one is incredibly long winded, I spend more time making masks than painting the model.
In order to do it efficiently masks need to be created for each material on a model/mesh. Once the masks are created then the model needs to be edited again to remove the multiple materials and so to only have a single material. At which point you can then load the model into SP and start using your masks. Now after you done all this if you make a slight mistake the process is repeated again. It sucks, andI believe is easily solvable.
Can we please have a feature that automatically creates all mask's from each assigned material on the model, then removes all the materials so a single texture set can be created. Possibly the user can choose to group multiple materials into one, as maybe a single texture set is not enough.
This process need not be destructive either. Thanks. :)

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beloudest commented
Also if material UV masks overlap then warn the user. Cheers. Do it! Do it! :)