I put in a feature request about the morph tool asking for an option to restrict the influence of the brush to a radius of verts on the surface under the brush, instead of a sphere.  The tool is pretty hard to use on a character's face in its current form, imo.  You can create groups and set the brush to only affect that group but you still have the problem of what happens when you hit the border of that group, it mangles the mesh.

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