@Gabe Look into Zbrush’s UV Master Plugin. I really like the Protect/attract method, rather than a pure painting method. In Zbrush, this is done for flattening a model’s polygons for texture mapping. in the case of a face, you would want to protect the facial features (red) and attract edges in areas that are less important to preserve (blue)
This will result in a flattened mesh which preserves the mesh faces as desired, deforming as needed, to separate, using the attractors where possible. Note the semi-legible, almost fetus-like face has no discontinuations inside the protected region.
Without this control painting, you can wind up with a seam right in the middle of the face, when things dont go well (used attract feature to make this “worst case scenario”. Note the complete lack of a discernible facial pattern).
I think that this could be more useful than a true seam painting method, while still allowing for only seam painting, if attract is only used. in many cases, I dont care so much exactly where the seam lies, so long as it is not in a crucial area i am concerned with, such as a face. even just a pure “protect” brush would be more useful for me than a pure seam paint brush would be.