If "Export Groups" is enabled, Blender, for example, can automatically make vertex groups out of them.

"Do not always leave "X Center == 0" switched on. It makes sense if, for example, the center vertices of a head were moved during morphing (they are at X position 0). This happens easily when working with the Soft-Brush. I often use the soft brush on one half of the head (or chest) and then let Poser calculate the other half of the face/chest with the morph tool. This solves the problem of not being able to work symetrically with posed figures in Blender (and other modelers).

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